916988491 has 4 divisors (see below), whose sum is σ = 917968072. Its totient is φ = 916008912.

The previous prime is 916988461. The next prime is 916988521. The reversal of 916988491 is 194889619.

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

It is an interprime number because it is at equal distance from previous prime (916988461) and next prime (916988521).

It is a cyclic number.

It is not a de Polignac number, because 916988491 - 2⁷ = 916988363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (916988461) 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 3 ways as a sum of consecutive naturals, for example, 488385 + ... + 490258.

It is an arithmetic number, because the mean of its divisors is an integer number (229492018).

Almost surely, 2^916988491 is an apocalyptic number.

916988491 is a deficient number, since it is larger than the sum of its proper divisors (979581).

916988491 is an equidigital number, since it uses as much as digits as its factorization.

916988491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979580.

The product of its digits is 1119744, while the sum is 55.

The square root of 916988491 is about 30281.8178285254. The cubic root of 916988491 is about 971.5264487936.

The spelling of 916988491 in words is "nine hundred sixteen million, nine hundred eighty-eight thousand, four hundred ninety-one".