31919145 has 16 divisors (see below), whose sum is σ = 53759040. Its totient is φ = 16127424.

The previous prime is 31919141. The next prime is 31919161. The reversal of 31919145 is 54191913.

It is not a de Polignac number, because 31919145 - 2² = 31919141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31919141) 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, 55714 + ... + 56283.

It is an arithmetic number, because the mean of its divisors is an integer number (3359940).

Almost surely, 2^31919145 is an apocalyptic number.

It is an amenable number.

31919145 is a deficient number, since it is larger than the sum of its proper divisors (21839895).

31919145 is a wasteful number, since it uses less digits than its factorization.

31919145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112024.

The product of its digits is 4860, while the sum is 33.

The square root of 31919145 is about 5649.7030895437. The cubic root of 31919145 is about 317.2125904667.

The spelling of 31919145 in words is "thirty-one million, nine hundred nineteen thousand, one hundred forty-five".