391679941 has 2 divisors, whose sum is σ = 391679942. Its totient is φ = 391679940.

The previous prime is 391679921. The next prime is 391680007. The reversal of 391679941 is 149976193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387893025 + 3786916 = 19695^2 + 1946^2 .

It is a cyclic number.

It is not a de Polignac number, because 391679941 - 2²⁷ = 257462213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391679921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195839970 + 195839971.

It is an arithmetic number, because the mean of its divisors is an integer number (195839971).

Almost surely, 2^391679941 is an apocalyptic number.

It is an amenable number.

391679941 is a deficient number, since it is larger than the sum of its proper divisors (1).

391679941 is an equidigital number, since it uses as much as digits as its factorization.

391679941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 391679941 is about 19790.9055123812. The cubic root of 391679941 is about 731.6619051641.

The spelling of 391679941 in words is "three hundred ninety-one million, six hundred seventy-nine thousand, nine hundred forty-one".