31124513402 has 4 divisors (see below), whose sum is σ = 46686770106. Its totient is φ = 15562256700.

The previous prime is 31124513389. The next prime is 31124513419. The reversal of 31124513402 is 20431542113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20431542113 = 631 ⋅32379623.

It can be written as a sum of positive squares in only one way, i.e., 21608706001 + 9515807401 = 146999^2 + 97549^2 .

It is a super-2 number, since 2×31124513402² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7781128349 + ... + 7781128352.

Almost surely, 2^31124513402 is an apocalyptic number.

31124513402 is a deficient number, since it is larger than the sum of its proper divisors (15562256704).

31124513402 is a wasteful number, since it uses less digits than its factorization.

31124513402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15562256703.

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 31124513402 in words is "thirty-one billion, one hundred twenty-four million, five hundred thirteen thousand, four hundred two".