195668831 has 2 divisors, whose sum is σ = 195668832. Its totient is φ = 195668830.

The previous prime is 195668777. The next prime is 195668833. The reversal of 195668831 is 138866591.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195668831 is a prime.

It is a super-2 number, since 2×195668831² = 76572582849813122, which contains 22 as substring.

Together with 195668833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195668833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97834415 + 97834416.

It is an arithmetic number, because the mean of its divisors is an integer number (97834416).

Almost surely, 2^195668831 is an apocalyptic number.

195668831 is a deficient number, since it is larger than the sum of its proper divisors (1).

195668831 is an equidigital number, since it uses as much as digits as its factorization.

195668831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 195668831 is about 13988.1675354565. The cubic root of 195668831 is about 580.5512308008.

The spelling of 195668831 in words is "one hundred ninety-five million, six hundred sixty-eight thousand, eight hundred thirty-one".