195591967 has 2 divisors, whose sum is σ = 195591968. Its totient is φ = 195591966.

The previous prime is 195591941. The next prime is 195591973. The reversal of 195591967 is 769195591.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195591967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195591917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97795983 + 97795984.

It is an arithmetic number, because the mean of its divisors is an integer number (97795984).

Almost surely, 2^195591967 is an apocalyptic number.

195591967 is a deficient number, since it is larger than the sum of its proper divisors (1).

195591967 is an equidigital number, since it uses as much as digits as its factorization.

195591967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 765450, while the sum is 52.

The square root of 195591967 is about 13985.4198006352. The cubic root of 195591967 is about 580.4752021116.

The spelling of 195591967 in words is "one hundred ninety-five million, five hundred ninety-one thousand, nine hundred sixty-seven".