79221901 has 4 divisors (see below), whose sum is σ = 86423904. Its totient is φ = 72019900.

The previous prime is 79221899. The next prime is 79221929. The reversal of 79221901 is 10912297.

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.

It is a cyclic number.

It is not a de Polignac number, because 79221901 - 2¹ = 79221899 is a prime.

It is a super-2 number, since 2×79221901² = 12552219196107602, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79221941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3600985 + ... + 3601006.

It is an arithmetic number, because the mean of its divisors is an integer number (21605976).

Almost surely, 2^79221901 is an apocalyptic number.

79221901 is the 3981-st centered decagonal number.

It is an amenable number.

79221901 is a deficient number, since it is larger than the sum of its proper divisors (7202003).

79221901 is a wasteful number, since it uses less digits than its factorization.

79221901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7202002.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 79221901 is about 8900.6685703940. The cubic root of 79221901 is about 429.4854147230.

The spelling of 79221901 in words is "seventy-nine million, two hundred twenty-one thousand, nine hundred one".