679211791 has 4 divisors (see below), whose sum is σ = 714959800. Its totient is φ = 643463784.

The previous prime is 679211779. The next prime is 679211803. The reversal of 679211791 is 197112976.

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

It is an interprime number because it is at equal distance from previous prime (679211779) and next prime (679211803).

It is a cyclic number.

It is not a de Polignac number, because 679211791 - 2⁹ = 679211279 is a prime.

It is a super-2 number, since 2×679211791² = 922657314066855362, 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 (679211191) 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, 17873976 + ... + 17874013.

It is an arithmetic number, because the mean of its divisors is an integer number (178739950).

Almost surely, 2^679211791 is an apocalyptic number.

679211791 is a deficient number, since it is larger than the sum of its proper divisors (35748009).

679211791 is a wasteful number, since it uses less digits than its factorization.

679211791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35748008.

The product of its digits is 47628, while the sum is 43.

The square root of 679211791 is about 26061.6920210488. The cubic root of 679211791 is about 879.0260363318.

The spelling of 679211791 in words is "six hundred seventy-nine million, two hundred eleven thousand, seven hundred ninety-one".