31645490918 has 4 divisors (see below), whose sum is σ = 47468236380. Its totient is φ = 15822745458.

The previous prime is 31645490911. The next prime is 31645490951. The reversal of 31645490918 is 81909454613.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31645490911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7911372728 + ... + 7911372731.

It is an arithmetic number, because the mean of its divisors is an integer number (11867059095).

Almost surely, 2^31645490918 is an apocalyptic number.

31645490918 is a deficient number, since it is larger than the sum of its proper divisors (15822745462).

31645490918 is a wasteful number, since it uses less digits than its factorization.

31645490918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15822745461.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 31645490918 in words is "thirty-one billion, six hundred forty-five million, four hundred ninety thousand, nine hundred eighteen".