99931247 has 8 divisors (see below), whose sum is σ = 108828720. Its totient is φ = 91206720.

The previous prime is 99931231. The next prime is 99931261. The reversal of 99931247 is 74213999.

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 99931247 - 2⁴ = 99931231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99931198 and 99931207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99931747) 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, 42029 + ... + 44342.

It is an arithmetic number, because the mean of its divisors is an integer number (13603590).

Almost surely, 2^99931247 is an apocalyptic number.

99931247 is a deficient number, since it is larger than the sum of its proper divisors (8897473).

99931247 is a wasteful number, since it uses less digits than its factorization.

99931247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86473.

The product of its digits is 122472, while the sum is 44.

The square root of 99931247 is about 9996.5617589249. The cubic root of 99931247 is about 464.0524845877.

The spelling of 99931247 in words is "ninety-nine million, nine hundred thirty-one thousand, two hundred forty-seven".