291087252 has 72 divisors (see below), whose sum is σ = 748500480. Its totient is φ = 95371200.

The previous prime is 291087233. The next prime is 291087257. The reversal of 291087252 is 252780192.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291087257) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 810649 + ... + 811007.

It is an arithmetic number, because the mean of its divisors is an integer number (10395840).

Almost surely, 2^291087252 is an apocalyptic number.

It is an amenable number.

291087252 is an abundant number, since it is smaller than the sum of its proper divisors (457413228).

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

291087252 is a wasteful number, since it uses less digits than its factorization.

291087252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 291087252 is about 17061.2793189725. The cubic root of 291087252 is about 662.7367627477.

The spelling of 291087252 in words is "two hundred ninety-one million, eighty-seven thousand, two hundred fifty-two".