291142664 has 16 divisors (see below), whose sum is σ = 546075600. Its totient is φ = 145522512.

The previous prime is 291142633. The next prime is 291142667. The reversal of 291142664 is 466241192.

It is not an unprimeable number, because it can be changed into a prime (291142667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37919 + ... + 44945.

It is an arithmetic number, because the mean of its divisors is an integer number (34129725).

Almost surely, 2^291142664 is an apocalyptic number.

It is an amenable number.

291142664 is a deficient number, since it is larger than the sum of its proper divisors (254932936).

291142664 is a wasteful number, since it uses less digits than its factorization.

291142664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212 (or 12208 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 291142664 is about 17062.9031527463. The cubic root of 291142664 is about 662.7788134149.

The spelling of 291142664 in words is "two hundred ninety-one million, one hundred forty-two thousand, six hundred sixty-four".