679195691 has 4 divisors (see below), whose sum is σ = 679335984. Its totient is φ = 679055400.

The previous prime is 679195663. The next prime is 679195711. The reversal of 679195691 is 196591976.

It is a happy number.

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 679195691 - 2¹⁸ = 678933547 is a prime.

It is a super-2 number, since 2×679195691² = 922613573345934962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679195091) 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, 62615 + ... + 72656.

It is an arithmetic number, because the mean of its divisors is an integer number (169833996).

Almost surely, 2^679195691 is an apocalyptic number.

679195691 is a deficient number, since it is larger than the sum of its proper divisors (140293).

679195691 is a wasteful number, since it uses less digits than its factorization.

679195691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140292.

The product of its digits is 918540, while the sum is 53.

The square root of 679195691 is about 26061.3831367408. The cubic root of 679195691 is about 879.0190908149.

The spelling of 679195691 in words is "six hundred seventy-nine million, one hundred ninety-five thousand, six hundred ninety-one".