31511401242 has 16 divisors (see below), whose sum is σ = 64559944512. Its totient is φ = 10247610080.

The previous prime is 31511401231. The next prime is 31511401253. The reversal of 31511401242 is 24210411513.

It is an interprime number because it is at equal distance from previous prime (31511401231) and next prime (31511401253).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64047318 + ... + 64047809.

It is an arithmetic number, because the mean of its divisors is an integer number (4034996532).

Almost surely, 2^31511401242 is an apocalyptic number.

31511401242 is an abundant number, since it is smaller than the sum of its proper divisors (33048543270).

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

31511401242 is a wasteful number, since it uses less digits than its factorization.

31511401242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128095173.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 31511401242 its reverse (24210411513), we get a palindrome (55721812755).

The spelling of 31511401242 in words is "thirty-one billion, five hundred eleven million, four hundred one thousand, two hundred forty-two".