89981491 has 2 divisors, whose sum is σ = 89981492. Its totient is φ = 89981490.

The previous prime is 89981449. The next prime is 89981501. The reversal of 89981491 is 19418998.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89981491 - 2⁷ = 89981363 is a prime.

It is not a weakly prime, because it can be changed into another prime (89981191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44990745 + 44990746.

It is an arithmetic number, because the mean of its divisors is an integer number (44990746).

Almost surely, 2^89981491 is an apocalyptic number.

89981491 is a deficient number, since it is larger than the sum of its proper divisors (1).

89981491 is an equidigital number, since it uses as much as digits as its factorization.

89981491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 49.

The square root of 89981491 is about 9485.8574203917. The cubic root of 89981491 is about 448.1097516901.

The spelling of 89981491 in words is "eighty-nine million, nine hundred eighty-one thousand, four hundred ninety-one".