99408531 has 4 divisors (see below), whose sum is σ = 132544712. Its totient is φ = 66272352.

The previous prime is 99408509. The next prime is 99408539. The reversal of 99408531 is 13580499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13580499 = 3 ⋅4526833.

It is not a de Polignac number, because 99408531 - 2¹⁵ = 99375763 is a prime.

It is a super-2 number, since 2×99408531² = 19764112071155922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99408531.

It is not an unprimeable number, because it can be changed into a prime (99408539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16568086 + ... + 16568091.

It is an arithmetic number, because the mean of its divisors is an integer number (33136178).

Almost surely, 2^99408531 is an apocalyptic number.

99408531 is a deficient number, since it is larger than the sum of its proper divisors (33136181).

99408531 is a wasteful number, since it uses less digits than its factorization.

99408531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33136180.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 99408531 is about 9970.3826907496. The cubic root of 99408531 is about 463.2419545596.

The spelling of 99408531 in words is "ninety-nine million, four hundred eight thousand, five hundred thirty-one".