31380626252506 has 4 divisors (see below), whose sum is σ = 47070939378762. Its totient is φ = 15690313126252.

The previous prime is 31380626252501. The next prime is 31380626252531. The reversal of 31380626252506 is 60525262608313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 30823649129025 + 556977123481 = 5551905^2 + 746309^2 .

It is a super-2 number, since 2×31380626252506² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 31380626252506.

It is not an unprimeable number, because it can be changed into a prime (31380626252501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7845156563125 + ... + 7845156563128.

Almost surely, 2^{31380626252506} is an apocalyptic number.

31380626252506 is a deficient number, since it is larger than the sum of its proper divisors (15690313126256).

31380626252506 is a wasteful number, since it uses less digits than its factorization.

31380626252506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15690313126255.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 31380626252506 in words is "thirty-one trillion, three hundred eighty billion, six hundred twenty-six million, two hundred fifty-two thousand, five hundred six".