31245204042 has 24 divisors (see below), whose sum is σ = 72905476644. Its totient is φ = 9613908864.

The previous prime is 31245204007. The next prime is 31245204091. The reversal of 31245204042 is 24040254213.

It can be written as a sum of positive squares in 2 ways, for example, as 30733946721 + 511257321 = 175311^2 + 22611^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31245203997 and 31245204015.

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, 66763023 + ... + 66763490.

Almost surely, 2^31245204042 is an apocalyptic number.

31245204042 is an abundant number, since it is smaller than the sum of its proper divisors (41660272602).

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

31245204042 is a wasteful number, since it uses less digits than its factorization.

31245204042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133526534 (or 133526531 counting only the distinct ones).

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

Adding to 31245204042 its reverse (24040254213), we get a palindrome (55285458255).

The spelling of 31245204042 in words is "thirty-one billion, two hundred forty-five million, two hundred four thousand, forty-two".