679991971 has 8 divisors (see below), whose sum is σ = 703990800. Its totient is φ = 656029920.

The previous prime is 679991903. The next prime is 679991999. The reversal of 679991971 is 179199976.

679991971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 679991971 - 2¹³ = 679983779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679991771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31560 + ... + 48538.

It is an arithmetic number, because the mean of its divisors is an integer number (87998850).

Almost surely, 2^679991971 is an apocalyptic number.

679991971 is a deficient number, since it is larger than the sum of its proper divisors (23998829).

679991971 is a wasteful number, since it uses less digits than its factorization.

679991971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18389.

The product of its digits is 1928934, while the sum is 58.

The square root of 679991971 is about 26076.6556713088. The cubic root of 679991971 is about 879.3624734234.

The spelling of 679991971 in words is "six hundred seventy-nine million, nine hundred ninety-one thousand, nine hundred seventy-one".