31143955 has 16 divisors (see below), whose sum is σ = 39377664. Its totient is φ = 23599840.

The previous prime is 31143947. The next prime is 31143967. The reversal of 31143955 is 55934113.

It is a happy number.

It is not a de Polignac number, because 31143955 - 2³ = 31143947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11040 + ... + 13570.

It is an arithmetic number, because the mean of its divisors is an integer number (2461104).

Almost surely, 2^31143955 is an apocalyptic number.

31143955 is a deficient number, since it is larger than the sum of its proper divisors (8233709).

31143955 is a wasteful number, since it uses less digits than its factorization.

31143955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666.

The product of its digits is 8100, while the sum is 31.

The square root of 31143955 is about 5580.6769302657. The cubic root of 31143955 is about 314.6235698233.

The spelling of 31143955 in words is "thirty-one million, one hundred forty-three thousand, nine hundred fifty-five".