99904531 has 2 divisors, whose sum is σ = 99904532. Its totient is φ = 99904530.

The previous prime is 99904513. The next prime is 99904549. The reversal of 99904531 is 13540999.

Together with previous prime (99904513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (99904513) and next prime (99904549).

It is a cyclic number.

It is not a de Polignac number, because 99904531 - 2⁵ = 99904499 is a prime.

It is a super-2 number, since 2×99904531² = 19961830628659922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99904501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49952265 + 49952266.

It is an arithmetic number, because the mean of its divisors is an integer number (49952266).

Almost surely, 2^99904531 is an apocalyptic number.

99904531 is a deficient number, since it is larger than the sum of its proper divisors (1).

99904531 is an equidigital number, since it uses as much as digits as its factorization.

99904531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 99904531 is about 9995.2254101646. The cubic root of 99904531 is about 464.0111270494.

The spelling of 99904531 in words is "ninety-nine million, nine hundred four thousand, five hundred thirty-one".