79131021 has 8 divisors (see below), whose sum is σ = 105572544. Its totient is φ = 52721760.

The previous prime is 79131011. The next prime is 79131023. The reversal of 79131021 is 12013197.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79131021 - 2⁹ = 79130509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79130982 and 79131000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79131023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1600 + ... + 12681.

It is an arithmetic number, because the mean of its divisors is an integer number (13196568).

Almost surely, 2^79131021 is an apocalyptic number.

It is an amenable number.

79131021 is a deficient number, since it is larger than the sum of its proper divisors (26441523).

79131021 is a wasteful number, since it uses less digits than its factorization.

79131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16131.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 79131021 is about 8895.5618709557. The cubic root of 79131021 is about 429.3211227420.

The spelling of 79131021 in words is "seventy-nine million, one hundred thirty-one thousand, twenty-one".