99531901 has 8 divisors (see below), whose sum is σ = 113811264. Its totient is φ = 85267680.

The previous prime is 99531893. The next prime is 99531919. The reversal of 99531901 is 10913599.

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

It is a cyclic number.

It is not a de Polignac number, because 99531901 - 2³ = 99531893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99531941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22401 + ... + 26473.

It is an arithmetic number, because the mean of its divisors is an integer number (14226408).

Almost surely, 2^99531901 is an apocalyptic number.

99531901 is the 8146-th pentagonal number.

It is an amenable number.

99531901 is a deficient number, since it is larger than the sum of its proper divisors (14279363).

99531901 is a wasteful number, since it uses less digits than its factorization.

99531901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7571.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 99531901 is about 9976.5675961224. The cubic root of 99531901 is about 463.4335093278.

It can be divided in two parts, 995 and 31901, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 99531901 in words is "ninety-nine million, five hundred thirty-one thousand, nine hundred one".