99642651 has 4 divisors (see below), whose sum is σ = 132856872. Its totient is φ = 66428432.

The previous prime is 99642617. The next prime is 99642671. The reversal of 99642651 is 15624699.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99642651 - 2⁹ = 99642139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99642671) 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, 16607106 + ... + 16607111.

It is an arithmetic number, because the mean of its divisors is an integer number (33214218).

Almost surely, 2^99642651 is an apocalyptic number.

99642651 is a deficient number, since it is larger than the sum of its proper divisors (33214221).

99642651 is a wasteful number, since it uses less digits than its factorization.

99642651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33214220.

The product of its digits is 116640, while the sum is 42.

The square root of 99642651 is about 9982.1165591271. The cubic root of 99642651 is about 463.6053344268.

The spelling of 99642651 in words is "ninety-nine million, six hundred forty-two thousand, six hundred fifty-one".