99631623 has 32 divisors (see below), whose sum is σ = 165505536. Its totient is φ = 51907968.

The previous prime is 99631621. The next prime is 99631633. The reversal of 99631623 is 32613699.

It is not a de Polignac number, because 99631623 - 2¹ = 99631621 is a prime.

It is a super-2 number, since 2×99631623² = 19852920603228258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99631621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20461 + ... + 24857.

It is an arithmetic number, because the mean of its divisors is an integer number (5172048).

Almost surely, 2^99631623 is an apocalyptic number.

99631623 is a deficient number, since it is larger than the sum of its proper divisors (65873913).

99631623 is a wasteful number, since it uses less digits than its factorization.

99631623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4503.

The product of its digits is 52488, while the sum is 39.

The square root of 99631623 is about 9981.5641559828. The cubic root of 99631623 is about 463.5882305454.

The spelling of 99631623 in words is "ninety-nine million, six hundred thirty-one thousand, six hundred twenty-three".