89990491 has 2 divisors, whose sum is σ = 89990492. Its totient is φ = 89990490.

The previous prime is 89990473. The next prime is 89990501. The reversal of 89990491 is 19409998.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89990491 - 2⁹ = 89989979 is a prime.

It is not a weakly prime, because it can be changed into another prime (89990471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44995245 + 44995246.

It is an arithmetic number, because the mean of its divisors is an integer number (44995246).

Almost surely, 2^89990491 is an apocalyptic number.

89990491 is a deficient number, since it is larger than the sum of its proper divisors (1).

89990491 is an equidigital number, since it uses as much as digits as its factorization.

89990491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 89990491 is about 9486.3317989621. The cubic root of 89990491 is about 448.1246912562.

The spelling of 89990491 in words is "eighty-nine million, nine hundred ninety thousand, four hundred ninety-one".