99642013 has 4 divisors (see below), whose sum is σ = 102072348. Its totient is φ = 97211680.

The previous prime is 99642001. The next prime is 99642043. The reversal of 99642013 is 31024699.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8191044 + 91450969 = 2862^2 + 9563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99642013 is a prime.

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 99642013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99642043) 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, 1215106 + ... + 1215187.

It is an arithmetic number, because the mean of its divisors is an integer number (25518087).

Almost surely, 2^99642013 is an apocalyptic number.

It is an amenable number.

99642013 is a deficient number, since it is larger than the sum of its proper divisors (2430335).

99642013 is a wasteful number, since it uses less digits than its factorization.

99642013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430334.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 99642013 is about 9982.0846019256. The cubic root of 99642013 is about 463.6043449549.

The spelling of 99642013 in words is "ninety-nine million, six hundred forty-two thousand, thirteen".