79023521 has 4 divisors (see below), whose sum is σ = 81748500. Its totient is φ = 76298544.

The previous prime is 79023517. The next prime is 79023547. The reversal of 79023521 is 12532097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12532097 = 1709 ⋅7333.

It can be written as a sum of positive squares in 2 ways, for example, as 17181025 + 61842496 = 4145^2 + 7864^2 .

It is a cyclic number.

It is not a de Polignac number, because 79023521 - 2² = 79023517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2724949 = 79023521 / (7 + 9 + 0 + 2 + 3 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79023421) 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, 1362446 + ... + 1362503.

It is an arithmetic number, because the mean of its divisors is an integer number (20437125).

Almost surely, 2^79023521 is an apocalyptic number.

It is an amenable number.

79023521 is a deficient number, since it is larger than the sum of its proper divisors (2724979).

79023521 is a wasteful number, since it uses less digits than its factorization.

79023521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724978.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 79023521 is about 8889.5174784687. The cubic root of 79023521 is about 429.1266228052.

The spelling of 79023521 in words is "seventy-nine million, twenty-three thousand, five hundred twenty-one".