79523891 has 4 divisors (see below), whose sum is σ = 79623000. Its totient is φ = 79424784.

The previous prime is 79523881. The next prime is 79523933. The reversal of 79523891 is 19832597.

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 79523891 - 2¹⁸ = 79261747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79523881) 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, 48341 + ... + 49958.

It is an arithmetic number, because the mean of its divisors is an integer number (19905750).

Almost surely, 2^79523891 is an apocalyptic number.

79523891 is a deficient number, since it is larger than the sum of its proper divisors (99109).

79523891 is an equidigital number, since it uses as much as digits as its factorization.

79523891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99108.

The product of its digits is 136080, while the sum is 44.

The square root of 79523891 is about 8917.6168901787. The cubic root of 79523891 is about 430.0304485379.

The spelling of 79523891 in words is "seventy-nine million, five hundred twenty-three thousand, eight hundred ninety-one".