291982491 has 6 divisors (see below), whose sum is σ = 421752500. Its totient is φ = 194654988.

The previous prime is 291982489. The next prime is 291982541. The reversal of 291982491 is 194289192.

It is not a de Polignac number, because 291982491 - 2¹ = 291982489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291982421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16221241 + ... + 16221258.

Almost surely, 2^291982491 is an apocalyptic number.

291982491 is a deficient number, since it is larger than the sum of its proper divisors (129770009).

291982491 is a wasteful number, since it uses less digits than its factorization.

291982491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32442505 (or 32442502 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 291982491 is about 17087.4951645933. The cubic root of 291982491 is about 663.4154831776.

The spelling of 291982491 in words is "two hundred ninety-one million, nine hundred eighty-two thousand, four hundred ninety-one".