99172649 has 4 divisors (see below), whose sum is σ = 99953664. Its totient is φ = 98391636.

The previous prime is 99172643. The next prime is 99172657. The reversal of 99172649 is 94627199.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99172649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99172643) 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, 390317 + ... + 390570.

It is an arithmetic number, because the mean of its divisors is an integer number (24988416).

Almost surely, 2^99172649 is an apocalyptic number.

It is an amenable number.

99172649 is a deficient number, since it is larger than the sum of its proper divisors (781015).

99172649 is a wasteful number, since it uses less digits than its factorization.

99172649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781014.

The product of its digits is 244944, while the sum is 47.

The square root of 99172649 is about 9958.5465304933. The cubic root of 99172649 is about 462.8752624211.

The spelling of 99172649 in words is "ninety-nine million, one hundred seventy-two thousand, six hundred forty-nine".