79487831 has 4 divisors (see below), whose sum is σ = 79505664. Its totient is φ = 79470000.

The previous prime is 79487789. The next prime is 79487833. The reversal of 79487831 is 13878497.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13878497 = 743 ⋅18679.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79487831 is a prime.

It is a super-2 number, since 2×79487831² = 12636630554169122, 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 (79487833) 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, 4331 + ... + 13331.

It is an arithmetic number, because the mean of its divisors is an integer number (19876416).

Almost surely, 2^79487831 is an apocalyptic number.

79487831 is a deficient number, since it is larger than the sum of its proper divisors (17833).

79487831 is an equidigital number, since it uses as much as digits as its factorization.

79487831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17832.

The product of its digits is 338688, while the sum is 47.

The square root of 79487831 is about 8915.5948203134. The cubic root of 79487831 is about 429.9654398040.

The spelling of 79487831 in words is "seventy-nine million, four hundred eighty-seven thousand, eight hundred thirty-one".