99902681 has 4 divisors (see below), whose sum is σ = 99965712. Its totient is φ = 99839652.

The previous prime is 99902653. The next prime is 99902771. The reversal of 99902681 is 18620999.

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-99902681 is a prime.

It is a super-2 number, since 2×99902681² = 19961091341975522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99902611) 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, 29075 + ... + 32328.

It is an arithmetic number, because the mean of its divisors is an integer number (24991428).

Almost surely, 2^99902681 is an apocalyptic number.

It is an amenable number.

99902681 is a deficient number, since it is larger than the sum of its proper divisors (63031).

99902681 is a wasteful number, since it uses less digits than its factorization.

99902681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63030.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 99902681 is about 9995.1328655501. The cubic root of 99902681 is about 464.0082628954.

The spelling of 99902681 in words is "ninety-nine million, nine hundred two thousand, six hundred eighty-one".