31209513122 has 6 divisors (see below), whose sum is σ = 46814644443. Its totient is φ = 15604631642.

The previous prime is 31209513113. The next prime is 31209513149. The reversal of 31209513122 is 22131590213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15604756561 + 15604756561 = 124919^2 + 124919^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=124919.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 187379 + ... + 312297.

Almost surely, 2^31209513122 is an apocalyptic number.

31209513122 is a deficient number, since it is larger than the sum of its proper divisors (15605131321).

31209513122 is an frugal number, since it uses more digits than its factorization.

31209513122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249840 (or 124921 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The spelling of 31209513122 in words is "thirty-one billion, two hundred nine million, five hundred thirteen thousand, one hundred twenty-two".