291089971 has 4 divisors (see below), whose sum is σ = 292249944. Its totient is φ = 289930000.

The previous prime is 291089959. The next prime is 291089993. The reversal of 291089971 is 179980192.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 291089971 - 2⁹ = 291089459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291080971) 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, 579610 + ... + 580111.

It is an arithmetic number, because the mean of its divisors is an integer number (73062486).

Almost surely, 2^291089971 is an apocalyptic number.

291089971 is a deficient number, since it is larger than the sum of its proper divisors (1159973).

291089971 is a wasteful number, since it uses less digits than its factorization.

291089971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159972.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 291089971 is about 17061.3590021428. The cubic root of 291089971 is about 662.7388262477.

The spelling of 291089971 in words is "two hundred ninety-one million, eighty-nine thousand, nine hundred seventy-one".