99744431 has 4 divisors (see below), whose sum is σ = 102177264. Its totient is φ = 97311600.

The previous prime is 99744419. The next prime is 99744439. The reversal of 99744431 is 13444799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99744431 - 2¹⁴ = 99728047 is a prime.

It is a super-2 number, since 2×99744431² = 19897903031027522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 2432791 = 99744431 / (9 + 9 + 7 + 4 + 4 + 4 + 3 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99744439) 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 3 ways as a sum of consecutive naturals, for example, 1216355 + ... + 1216436.

It is an arithmetic number, because the mean of its divisors is an integer number (25544316).

Almost surely, 2^99744431 is an apocalyptic number.

99744431 is a deficient number, since it is larger than the sum of its proper divisors (2432833).

99744431 is a wasteful number, since it uses less digits than its factorization.

99744431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432832.

The product of its digits is 108864, while the sum is 41.

The square root of 99744431 is about 9987.2133751112. The cubic root of 99744431 is about 463.7631306236.

The spelling of 99744431 in words is "ninety-nine million, seven hundred forty-four thousand, four hundred thirty-one".