99997813 has 16 divisors (see below), whose sum is σ = 106375680. Its totient is φ = 93811696.

The previous prime is 99997789. The next prime is 99997837. The reversal of 99997813 is 31879999.

It is an interprime number because it is at equal distance from previous prime (99997789) and next prime (99997837).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99997813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440406 + ... + 440632.

It is an arithmetic number, because the mean of its divisors is an integer number (6648480).

Almost surely, 2^99997813 is an apocalyptic number.

It is an amenable number.

99997813 is a deficient number, since it is larger than the sum of its proper divisors (6377867).

99997813 is a wasteful number, since it uses less digits than its factorization.

99997813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its digits is 1102248, while the sum is 55.

The square root of 99997813 is about 9999.8906494021. The cubic root of 99997813 is about 464.1554996184.

It can be divided in two parts, 9999 and 7813, that multiplied together give a palindrome (78122187).

The spelling of 99997813 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred thirteen".