99689631 has 4 divisors (see below), whose sum is σ = 132919512. Its totient is φ = 66459752.

The previous prime is 99689621. The next prime is 99689641. The reversal of 99689631 is 13698699.

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

It is an interprime number because it is at equal distance from previous prime (99689621) and next prime (99689641).

It is a cyclic number.

It is not a de Polignac number, because 99689631 - 2⁷ = 99689503 is a prime.

It is a super-2 number, since 2×99689631² = 19876045057832322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99689621) 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, 16614936 + ... + 16614941.

It is an arithmetic number, because the mean of its divisors is an integer number (33229878).

Almost surely, 2^99689631 is an apocalyptic number.

99689631 is a deficient number, since it is larger than the sum of its proper divisors (33229881).

99689631 is a wasteful number, since it uses less digits than its factorization.

99689631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33229880.

The product of its digits is 629856, while the sum is 51.

The square root of 99689631 is about 9984.4694901632. The cubic root of 99689631 is about 463.6781839422.

The spelling of 99689631 in words is "ninety-nine million, six hundred eighty-nine thousand, six hundred thirty-one".