291490972 has 12 divisors (see below), whose sum is σ = 510536880. Its totient is φ = 145623296.

The previous prime is 291490909. The next prime is 291490973. The reversal of 291490972 is 279094192.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291490973) 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, 25072 + ... + 34807.

It is an arithmetic number, because the mean of its divisors is an integer number (42544740).

Almost surely, 2^291490972 is an apocalyptic number.

It is an amenable number.

291490972 is a deficient number, since it is larger than the sum of its proper divisors (219045908).

291490972 is a wasteful number, since it uses less digits than its factorization.

291490972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61100 (or 61098 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 291490972 is about 17073.1066885907. The cubic root of 291490972 is about 663.0430128300.

The spelling of 291490972 in words is "two hundred ninety-one million, four hundred ninety thousand, nine hundred seventy-two".