679991941 has 6 divisors (see below), whose sum is σ = 710842790. Its totient is φ = 650426568.

The previous prime is 679991903. The next prime is 679991999. The reversal of 679991941 is 149199976.

It can be written as a sum of positive squares in only one way, i.e., 400400100 + 279591841 = 20010^2 + 16721^2 .

It is not a de Polignac number, because 679991941 - 2¹⁵ = 679959173 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 (679991141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642186 + ... + 643243.

Almost surely, 2^679991941 is an apocalyptic number.

It is an amenable number.

679991941 is a deficient number, since it is larger than the sum of its proper divisors (30850849).

679991941 is a wasteful number, since it uses less digits than its factorization.

679991941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285475 (or 1285452 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 55.

The square root of 679991941 is about 26076.6550960816. The cubic root of 679991941 is about 879.3624604914.

The spelling of 679991941 in words is "six hundred seventy-nine million, nine hundred ninety-one thousand, nine hundred forty-one".