99631775 has 12 divisors (see below), whose sum is σ = 126173472. Its totient is φ = 78008640.

The previous prime is 99631771. The next prime is 99631783. The reversal of 99631775 is 57713699.

It is a happy number.

It is not a de Polignac number, because 99631775 - 2² = 99631771 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99631771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41222 + ... + 43571.

It is an arithmetic number, because the mean of its divisors is an integer number (10514456).

Almost surely, 2^99631775 is an apocalyptic number.

99631775 is a deficient number, since it is larger than the sum of its proper divisors (26541697).

99631775 is a wasteful number, since it uses less digits than its factorization.

99631775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84850 (or 84845 counting only the distinct ones).

The product of its digits is 357210, while the sum is 47.

The square root of 99631775 is about 9981.5717700170. The cubic root of 99631775 is about 463.5884662985.

The spelling of 99631775 in words is "ninety-nine million, six hundred thirty-one thousand, seven hundred seventy-five".