31905018145 has 64 divisors (see below), whose sum is σ = 51537701376. Its totient is φ = 18311546880.

The previous prime is 31905018133. The next prime is 31905018149. The reversal of 31905018145 is 54181050913.

It is not a de Polignac number, because 31905018145 - 2⁵ = 31905018113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31905018149) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1978957 + ... + 1995013.

It is an arithmetic number, because the mean of its divisors is an integer number (805276584).

Almost surely, 2^31905018145 is an apocalyptic number.

31905018145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31905018145 is a deficient number, since it is larger than the sum of its proper divisors (19632683231).

31905018145 is a wasteful number, since it uses less digits than its factorization.

31905018145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16490.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 31905018145 in words is "thirty-one billion, nine hundred five million, eighteen thousand, one hundred forty-five".