31164540 has 96 divisors (see below), whose sum is σ = 99380736. Its totient is φ = 7223040.

The previous prime is 31164533. The next prime is 31164559. The reversal of 31164540 is 4546113.

It is a self number, because there is not a number n which added to its sum of digits gives 31164540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14154 + ... + 16206.

It is an arithmetic number, because the mean of its divisors is an integer number (1035216).

Almost surely, 2^31164540 is an apocalyptic number.

31164540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31164540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49690368).

31164540 is an abundant number, since it is smaller than the sum of its proper divisors (68216196).

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

31164540 is a wasteful number, since it uses less digits than its factorization.

31164540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099 (or 2097 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 31164540 is about 5582.5209359213. The cubic root of 31164540 is about 314.6928727297.

The spelling of 31164540 in words is "thirty-one million, one hundred sixty-four thousand, five hundred forty".