31399245871009 has 3 divisors (see below), whose sum is σ = 31399251474513. Its totient is φ = 31399240267506.

The previous prime is 31399245870977. The next prime is 31399245871087. The reversal of 31399245871009 is 90017854299313.

The square root of 31399245871009 is 5603503.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 31399245871009 - 2⁵ = 31399245870977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31399245871099) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2801752 + ... + 8405254.

It is an arithmetic number, because the mean of its divisors is an integer number (10466417158171).

Almost surely, 2^{31399245871009} is an apocalyptic number.

31399245871009 is the 5603503-rd square number.

31399245871009 is the 2801752-nd centered octagonal number.

It is an amenable number.

31399245871009 is a deficient number, since it is larger than the sum of its proper divisors (5603504).

31399245871009 is an frugal number, since it uses more digits than its factorization.

31399245871009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11207006 (or 5603503 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 31399245871009 in words is "thirty-one trillion, three hundred ninety-nine billion, two hundred forty-five million, eight hundred seventy-one thousand, nine".