31131042402 has 16 divisors (see below), whose sum is σ = 62609919840. Its totient is φ = 10319041632.

The previous prime is 31131042391. The next prime is 31131042421. The reversal of 31131042402 is 20424013113.

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, 14491963 + ... + 14494110.

It is an arithmetic number, because the mean of its divisors is an integer number (3913119990).

Almost surely, 2^31131042402 is an apocalyptic number.

31131042402 is an abundant number, since it is smaller than the sum of its proper divisors (31478877438).

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

31131042402 is a wasteful number, since it uses less digits than its factorization.

31131042402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28986257.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31131042402 its reverse (20424013113), we get a palindrome (51555055515).

The spelling of 31131042402 in words is "thirty-one billion, one hundred thirty-one million, forty-two thousand, four hundred two".