679129891 has 4 divisors (see below), whose sum is σ = 740868984. Its totient is φ = 617390800.

The previous prime is 679129849. The next prime is 679129903. The reversal of 679129891 is 198921976.

679129891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 679129891 - 2¹¹ = 679127843 is a prime.

It is a super-2 number, since 2×679129891² = 922434817699343762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679129811) 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, 30869530 + ... + 30869551.

It is an arithmetic number, because the mean of its divisors is an integer number (185217246).

Almost surely, 2^679129891 is an apocalyptic number.

679129891 is a deficient number, since it is larger than the sum of its proper divisors (61739093).

679129891 is a wasteful number, since it uses less digits than its factorization.

679129891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61739092.

The product of its digits is 489888, while the sum is 52.

The square root of 679129891 is about 26060.1207019461. The cubic root of 679129891 is about 878.9907036481.

The spelling of 679129891 in words is "six hundred seventy-nine million, one hundred twenty-nine thousand, eight hundred ninety-one".