99031231 has 8 divisors (see below), whose sum is σ = 106928640. Its totient is φ = 91173792.

The previous prime is 99031223. The next prime is 99031237. The reversal of 99031231 is 13213099.

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 99031231 - 2³ = 99031223 is a prime.

It is a super-2 number, since 2×99031231² = 19614369426750722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99031231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99031237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4735 + ... + 14848.

It is an arithmetic number, because the mean of its divisors is an integer number (13366080).

Almost surely, 2^99031231 is an apocalyptic number.

99031231 is a deficient number, since it is larger than the sum of its proper divisors (7897409).

99031231 is a wasteful number, since it uses less digits than its factorization.

99031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19985.

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

The square root of 99031231 is about 9951.4436641123. The cubic root of 99031231 is about 462.6551411360.

The spelling of 99031231 in words is "ninety-nine million, thirty-one thousand, two hundred thirty-one".