79269991 has 4 divisors (see below), whose sum is σ = 79407952. Its totient is φ = 79132032.

The previous prime is 79269979. The next prime is 79270001. The reversal of 79269991 is 19996297.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79269991 - 2⁵ = 79269959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79261991) 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, 68115 + ... + 69268.

It is an arithmetic number, because the mean of its divisors is an integer number (19851988).

Almost surely, 2^79269991 is an apocalyptic number.

79269991 is a deficient number, since it is larger than the sum of its proper divisors (137961).

79269991 is a wasteful number, since it uses less digits than its factorization.

79269991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137960.

The product of its digits is 551124, while the sum is 52.

The square root of 79269991 is about 8903.3696430060. The cubic root of 79269991 is about 429.5723005275.

The spelling of 79269991 in words is "seventy-nine million, two hundred sixty-nine thousand, nine hundred ninety-one".