79431431 has 4 divisors (see below), whose sum is σ = 79761264. Its totient is φ = 79101600.

The previous prime is 79431409. The next prime is 79431467. The reversal of 79431431 is 13413497.

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 79431431 - 2¹⁴ = 79415047 is a prime.

It is a super-2 number, since 2×79431431² = 12618704461415522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79431491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164555 + ... + 165036.

It is an arithmetic number, because the mean of its divisors is an integer number (19940316).

Almost surely, 2^79431431 is an apocalyptic number.

79431431 is a deficient number, since it is larger than the sum of its proper divisors (329833).

79431431 is a wasteful number, since it uses less digits than its factorization.

79431431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329832.

The product of its digits is 9072, while the sum is 32.

The square root of 79431431 is about 8912.4312620070. The cubic root of 79431431 is about 429.8637228147.

The spelling of 79431431 in words is "seventy-nine million, four hundred thirty-one thousand, four hundred thirty-one".