79909121 has 4 divisors (see below), whose sum is σ = 79940544. Its totient is φ = 79877700.

The previous prime is 79909111. The next prime is 79909127. The reversal of 79909121 is 12190997.

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 79909121 - 2⁶ = 79909057 is a prime.

It is a super-3 number, since 3×79909121³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79909127) 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, 11525 + ... + 17106.

It is an arithmetic number, because the mean of its divisors is an integer number (19985136).

Almost surely, 2^79909121 is an apocalyptic number.

It is an amenable number.

79909121 is a deficient number, since it is larger than the sum of its proper divisors (31423).

79909121 is a wasteful number, since it uses less digits than its factorization.

79909121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31422.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 79909121 is about 8939.1901758493. The cubic root of 79909121 is about 430.7237154593.

The spelling of 79909121 in words is "seventy-nine million, nine hundred nine thousand, one hundred twenty-one".