79550921 has 4 divisors (see below), whose sum is σ = 79741200. Its totient is φ = 79360644.

The previous prime is 79550899. The next prime is 79550941. The reversal of 79550921 is 12905597.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12905597 = 73 ⋅176789.

It is a cyclic number.

It is not a de Polignac number, because 79550921 - 2¹⁸ = 79288777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79550941) 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, 94511 + ... + 95348.

It is an arithmetic number, because the mean of its divisors is an integer number (19935300).

Almost surely, 2^79550921 is an apocalyptic number.

It is an amenable number.

79550921 is a deficient number, since it is larger than the sum of its proper divisors (190279).

79550921 is a wasteful number, since it uses less digits than its factorization.

79550921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190278.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 79550921 is about 8919.1323008463. The cubic root of 79550921 is about 430.0791651612.

The spelling of 79550921 in words is "seventy-nine million, five hundred fifty thousand, nine hundred twenty-one".