31155420504 has 64 divisors (see below), whose sum is σ = 86147036640. Its totient is φ = 9327191040.

The previous prime is 31155420493. The next prime is 31155420521. The reversal of 31155420504 is 40502455113.

It is a super-2 number, since 2×31155420504² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1337877 + ... + 1360964.

Almost surely, 2^31155420504 is an apocalyptic number.

It is an amenable number.

31155420504 is an abundant number, since it is smaller than the sum of its proper divisors (54991616136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31155420504 is a wasteful number, since it uses less digits than its factorization.

31155420504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698900 (or 2698896 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 31155420504 its reverse (40502455113), we get a palindrome (71657875617).

The spelling of 31155420504 in words is "thirty-one billion, one hundred fifty-five million, four hundred twenty thousand, five hundred four".