31540044018 has 32 divisors (see below), whose sum is σ = 72752929920. Its totient is φ = 8928766080.

The previous prime is 31540044017. The next prime is 31540044059. The reversal of 31540044018 is 81044004513.

It is not an unprimeable number, because it can be changed into a prime (31540044017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3440163 + ... + 3449318.

It is an arithmetic number, because the mean of its divisors is an integer number (2273529060).

Almost surely, 2^31540044018 is an apocalyptic number.

31540044018 is an abundant number, since it is smaller than the sum of its proper divisors (41212885902).

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

31540044018 is a wasteful number, since it uses less digits than its factorization.

31540044018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889602.

The product of its (nonzero) digits is 7680, while the sum is 30.

The spelling of 31540044018 in words is "thirty-one billion, five hundred forty million, forty-four thousand, eighteen".