79724431 has 2 divisors, whose sum is σ = 79724432. Its totient is φ = 79724430.

The previous prime is 79724429. The next prime is 79724461. The reversal of 79724431 is 13442797.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79724431 - 2¹ = 79724429 is a prime.

It is a super-2 number, since 2×79724431² = 12711969796547522, which contains 22 as substring.

Together with 79724429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79724461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39862215 + 39862216.

It is an arithmetic number, because the mean of its divisors is an integer number (39862216).

Almost surely, 2^79724431 is an apocalyptic number.

79724431 is a deficient number, since it is larger than the sum of its proper divisors (1).

79724431 is an equidigital number, since it uses as much as digits as its factorization.

79724431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 79724431 is about 8928.8538458192. The cubic root of 79724431 is about 430.3916226696.

It can be divided in two parts, 7972 and 4431, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 79724431 in words is "seventy-nine million, seven hundred twenty-four thousand, four hundred thirty-one".