195312979 has 2 divisors, whose sum is σ = 195312980. Its totient is φ = 195312978.

The previous prime is 195312967. The next prime is 195313031. The reversal of 195312979 is 979213591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195312979 - 2⁵ = 195312947 is a prime.

It is not a weakly prime, because it can be changed into another prime (195312959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97656489 + 97656490.

It is an arithmetic number, because the mean of its divisors is an integer number (97656490).

Almost surely, 2^195312979 is an apocalyptic number.

195312979 is a deficient number, since it is larger than the sum of its proper divisors (1).

195312979 is an equidigital number, since it uses as much as digits as its factorization.

195312979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 46.

The square root of 195312979 is about 13975.4419965882. The cubic root of 195312979 is about 580.1990785097.

The spelling of 195312979 in words is "one hundred ninety-five million, three hundred twelve thousand, nine hundred seventy-nine".