99975613 has 4 divisors (see below), whose sum is σ = 100705500. Its totient is φ = 99245728.

The previous prime is 99975607. The next prime is 99975619. The reversal of 99975613 is 31657999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31657999 = 2281 ⋅13879.

It is an interprime number because it is at equal distance from previous prime (99975607) and next prime (99975619).

It can be written as a sum of positive squares in 2 ways, for example, as 42549529 + 57426084 = 6523^2 + 7578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99975613 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99975619) 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, 364738 + ... + 365011.

It is an arithmetic number, because the mean of its divisors is an integer number (25176375).

Almost surely, 2^99975613 is an apocalyptic number.

It is an amenable number.

99975613 is a deficient number, since it is larger than the sum of its proper divisors (729887).

99975613 is a wasteful number, since it uses less digits than its factorization.

99975613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729886.

The product of its digits is 459270, while the sum is 49.

The square root of 99975613 is about 9998.7805756502. The cubic root of 99975613 is about 464.1211488180.

The spelling of 99975613 in words is "ninety-nine million, nine hundred seventy-five thousand, six hundred thirteen".