289904491 has 2 divisors, whose sum is σ = 289904492. Its totient is φ = 289904490.

The previous prime is 289904479. The next prime is 289904501. The reversal of 289904491 is 194409982.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289904491 is a prime.

It is a super-2 number, since 2×289904491² = 168089227803938162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (289904411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144952245 + 144952246.

It is an arithmetic number, because the mean of its divisors is an integer number (144952246).

Almost surely, 2^289904491 is an apocalyptic number.

289904491 is a deficient number, since it is larger than the sum of its proper divisors (1).

289904491 is an equidigital number, since it uses as much as digits as its factorization.

289904491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 289904491 is about 17026.5818942030. The cubic root of 289904491 is about 661.8379219746.

The spelling of 289904491 in words is "two hundred eighty-nine million, nine hundred four thousand, four hundred ninety-one".