79091869 has 4 divisors (see below), whose sum is σ = 79295580. Its totient is φ = 78888160.

The previous prime is 79091867. The next prime is 79091893. The reversal of 79091869 is 96819097.

79091869 = T₂ + T₃ + ... + T₇₇₉.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39212644 + 39879225 = 6262^2 + 6315^2 .

It is a cyclic number.

It is not a de Polignac number, because 79091869 - 2¹ = 79091867 is a prime.

It is a super-2 number, since 2×79091869² = 12511047483826322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79091861) 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, 101272 + ... + 102049.

It is an arithmetic number, because the mean of its divisors is an integer number (19823895).

Almost surely, 2^79091869 is an apocalyptic number.

It is an amenable number.

79091869 is a deficient number, since it is larger than the sum of its proper divisors (203711).

79091869 is a wasteful number, since it uses less digits than its factorization.

79091869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203710.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 79091869 is about 8893.3609507317. The cubic root of 79091869 is about 429.2503053671.

The spelling of 79091869 in words is "seventy-nine million, ninety-one thousand, eight hundred sixty-nine".