99550631 has 4 divisors (see below), whose sum is σ = 99590064. Its totient is φ = 99511200.

The previous prime is 99550613. The next prime is 99550637. The reversal of 99550631 is 13605599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13605599 = 7 ⋅1943657.

It is a cyclic number.

It is not a de Polignac number, because 99550631 - 2²⁶ = 32441767 is a prime.

It is a super-2 number, since 2×99550631² = 19820656264996322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99550637) 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, 15650 + ... + 21071.

It is an arithmetic number, because the mean of its divisors is an integer number (24897516).

Almost surely, 2^99550631 is an apocalyptic number.

99550631 is a deficient number, since it is larger than the sum of its proper divisors (39433).

99550631 is a wasteful number, since it uses less digits than its factorization.

99550631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39432.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 99550631 is about 9977.5062515641. The cubic root of 99550631 is about 463.4625772786.

The spelling of 99550631 in words is "ninety-nine million, five hundred fifty thousand, six hundred thirty-one".