79340861 has 4 divisors (see below), whose sum is σ = 79873500. Its totient is φ = 78808224.

The previous prime is 79340851. The next prime is 79340881. The reversal of 79340861 is 16804397.

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 10201636 + 69139225 = 3194^2 + 8315^2 .

It is a cyclic number.

It is not a de Polignac number, because 79340861 - 2¹⁴ = 79324477 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 (79340801) 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, 266096 + ... + 266393.

It is an arithmetic number, because the mean of its divisors is an integer number (19968375).

Almost surely, 2^79340861 is an apocalyptic number.

It is an amenable number.

79340861 is a deficient number, since it is larger than the sum of its proper divisors (532639).

79340861 is a wasteful number, since it uses less digits than its factorization.

79340861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532638.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 79340861 is about 8907.3487076683. The cubic root of 79340861 is about 429.7002796887.

Subtracting from 79340861 its reverse (16804397), we obtain a square (62536464 = 7908²).

The spelling of 79340861 in words is "seventy-nine million, three hundred forty thousand, eight hundred sixty-one".