99631 has 8 divisors (see below), whose sum is σ = 116864. Its totient is φ = 83160.

The previous prime is 99623. The next prime is 99643. The reversal of 99631 is 13699.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99631 - 2³ = 99623 is a prime.

It is a super-2 number, since 2×99631² = 19852672322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136 + ... + 466.

It is an arithmetic number, because the mean of its divisors is an integer number (14608).

2⁹⁹⁶³¹ is an apocalyptic number.

99631 is a deficient number, since it is larger than the sum of its proper divisors (17233).

99631 is a wasteful number, since it uses less digits than its factorization.

99631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its digits is 1458, while the sum is 28.

The square root of 99631 is about 315.6437865696. The cubic root of 99631 is about 46.3587264266.

It can be divided in two parts, 996 and 31, that multiplied together give a triangular number (30876 = T₂₄₈).

The spelling of 99631 in words is "ninety-nine thousand, six hundred thirty-one".