99072609 has 4 divisors (see below), whose sum is σ = 132096816. Its totient is φ = 66048404.

The previous prime is 99072587. The next prime is 99072629. The reversal of 99072609 is 90627099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90627099 = 3 ⋅30209033.

It is a cyclic number.

It is not a de Polignac number, because 99072609 - 2⁸ = 99072353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99072629) 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, 16512099 + ... + 16512104.

It is an arithmetic number, because the mean of its divisors is an integer number (33024204).

Almost surely, 2^99072609 is an apocalyptic number.

It is an amenable number.

99072609 is a deficient number, since it is larger than the sum of its proper divisors (33024207).

99072609 is a wasteful number, since it uses less digits than its factorization.

99072609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33024206.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 99072609 is about 9953.5224418293. The cubic root of 99072609 is about 462.7195688880.

It can be divided in two parts, 99072 and 609, that added together give a triangular number (99681 = T₄₄₆).

The spelling of 99072609 in words is "ninety-nine million, seventy-two thousand, six hundred nine".