31139896225 has 27 divisors (see below), whose sum is σ = 40023771307. Its totient is φ = 24033121280.

The previous prime is 31139896199. The next prime is 31139896237. The reversal of 31139896225 is 52269893113.

The square root of 31139896225 is 176465.

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

It can be written as a sum of positive squares in 13 ways, for example, as 23973257889 + 7166638336 = 154833^2 + 84656^2 .

It is not a de Polignac number, because 31139896225 - 2⁹ = 31139895713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 25586817 + ... + 25588033.

Almost surely, 2^31139896225 is an apocalyptic number.

31139896225 is the 176465-th square number.

31139896225 is the 88233-rd centered octagonal number.

It is an amenable number.

31139896225 is a deficient number, since it is larger than the sum of its proper divisors (8883875082).

31139896225 is an frugal number, since it uses more digits than its factorization.

31139896225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502 (or 1251 counting only the distinct ones).

The product of its digits is 699840, while the sum is 49.

Multiplying 31139896225 by its sum of digits (49), we get a square (1525854915025 = 1235255²).

The spelling of 31139896225 in words is "thirty-one billion, one hundred thirty-nine million, eight hundred ninety-six thousand, two hundred twenty-five".