31542420402 has 24 divisors (see below), whose sum is σ = 69109801020. Its totient is φ = 10396003200.

The previous prime is 31542420389. The next prime is 31542420419. The reversal of 31542420402 is 20402424513.

31542420402 is a `hidden beast` number, since 3 + 15 + 4 + 242 + 0 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23706452961 + 7835967441 = 153969^2 + 88521^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9843099 + ... + 9846302.

Almost surely, 2^31542420402 is an apocalyptic number.

31542420402 is an abundant number, since it is smaller than the sum of its proper divisors (37567380618).

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

31542420402 is a wasteful number, since it uses less digits than its factorization.

31542420402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19689498 (or 19689495 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 31542420402 its reverse (20402424513), we get a palindrome (51944844915).

The spelling of 31542420402 in words is "thirty-one billion, five hundred forty-two million, four hundred twenty thousand, four hundred two".