31941945 has 80 divisors (see below), whose sum is σ = 68999040. Its totient is φ = 13810176.

The previous prime is 31941937. The next prime is 31941947. The reversal of 31941945 is 54914913.

It is a happy number.

It is not a de Polignac number, because 31941945 - 2³ = 31941937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31941947) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 53569 + ... + 54161.

It is an arithmetic number, because the mean of its divisors is an integer number (862488).

Almost surely, 2^31941945 is an apocalyptic number.

31941945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31941945 is an abundant number, since it is smaller than the sum of its proper divisors (37057095).

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

31941945 is a wasteful number, since it uses less digits than its factorization.

31941945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 627 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 31941945 is about 5651.7205344921. The cubic root of 31941945 is about 317.2881013206.

The spelling of 31941945 in words is "thirty-one million, nine hundred forty-one thousand, nine hundred forty-five".