31142402520 has 32 divisors (see below), whose sum is σ = 93427207920. Its totient is φ = 8304640640.

The previous prime is 31142402509. The next prime is 31142402563. The reversal of 31142402520 is 2520424113.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129759891 + ... + 129760130.

Almost surely, 2^31142402520 is an apocalyptic number.

31142402520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31142402520 is an abundant number, since it is smaller than the sum of its proper divisors (62284805400).

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

31142402520 is a wasteful number, since it uses less digits than its factorization.

31142402520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259520035 (or 259520031 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 31142402520 its reverse (2520424113), we get a palindrome (33662826633).

The spelling of 31142402520 in words is "thirty-one billion, one hundred forty-two million, four hundred two thousand, five hundred twenty".