31896594357849 has 45 divisors (see below), whose sum is σ = 51596239378959. Its totient is φ = 19628266816080.

The previous prime is 31896594357791. The next prime is 31896594357857. The reversal of 31896594357849 is 94875349569813.

The square root of 31896594357849 is 5647707.

It is a perfect power (a square), and thus also a powerful number.

31896594357849 is a `hidden beast` number, since 3 + 1 + 8 + 96 + 59 + 435 + 7 + 8 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4718431118025 + 27178163239824 = 2172195^2 + 5213268^2 .

It is not a de Polignac number, because 31896594357849 - 2²¹ = 31896592260697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (31896594357149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 660757584 + ... + 660805854.

Almost surely, 2^{31896594357849} is an apocalyptic number.

31896594357849 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

31896594357849 is the 5647707-th square number.

31896594357849 is the 2823854-th centered octagonal number.

It is an amenable number.

31896594357849 is a deficient number, since it is larger than the sum of its proper divisors (19699645021110).

31896594357849 is an frugal number, since it uses more digits than its factorization.

31896594357849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96580 (or 48287 counting only the distinct ones).

The product of its digits is 7054387200, while the sum is 81.

31896594357849 divided by its sum of digits (81) gives a square (393785115529 = 627523²).

The spelling of 31896594357849 in words is "thirty-one trillion, eight hundred ninety-six billion, five hundred ninety-four million, three hundred fifty-seven thousand, eight hundred forty-nine".