79561087 has 4 divisors (see below), whose sum is σ = 80909640. Its totient is φ = 78212536.

The previous prime is 79561081. The next prime is 79561091. The reversal of 79561087 is 78016597.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79561087 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 (79561081) 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, 674188 + ... + 674305.

It is an arithmetic number, because the mean of its divisors is an integer number (20227410).

Almost surely, 2^79561087 is an apocalyptic number.

79561087 is a deficient number, since it is larger than the sum of its proper divisors (1348553).

79561087 is a wasteful number, since it uses less digits than its factorization.

79561087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348552.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 79561087 is about 8919.7021811269. The cubic root of 79561087 is about 430.0974846581.

The spelling of 79561087 in words is "seventy-nine million, five hundred sixty-one thousand, eighty-seven".