31579777849 has 27 divisors (see below), whose sum is σ = 34225556517. Its totient is φ = 29133996408.

The previous prime is 31579777819. The next prime is 31579777913. The reversal of 31579777849 is 94877797513.

The square root of 31579777849 is 177707.

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

It is not a de Polignac number, because 31579777849 - 2¹⁵ = 31579745081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31579777819) 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 26 ways as a sum of consecutive naturals, for example, 158692252 + ... + 158692450.

Almost surely, 2^31579777849 is an apocalyptic number.

31579777849 is the 177707-th square number.

31579777849 is the 88854-th centered octagonal number.

It is an amenable number.

31579777849 is a deficient number, since it is larger than the sum of its proper divisors (2645778668).

31579777849 is an frugal number, since it uses more digits than its factorization.

31579777849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 265 counting only the distinct ones).

The product of its digits is 93350880, while the sum is 67.

The spelling of 31579777849 in words is "thirty-one billion, five hundred seventy-nine million, seven hundred seventy-seven thousand, eight hundred forty-nine".