99412591 has 2 divisors, whose sum is σ = 99412592. Its totient is φ = 99412590.

The previous prime is 99412571. The next prime is 99412619. The reversal of 99412591 is 19521499.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99412591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99412571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49706295 + 49706296.

It is an arithmetic number, because the mean of its divisors is an integer number (49706296).

Almost surely, 2^99412591 is an apocalyptic number.

99412591 is a deficient number, since it is larger than the sum of its proper divisors (1).

99412591 is an equidigital number, since it uses as much as digits as its factorization.

99412591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 40.

The square root of 99412591 is about 9970.5862916882. The cubic root of 99412591 is about 463.2482609826.

The spelling of 99412591 in words is "ninety-nine million, four hundred twelve thousand, five hundred ninety-one".