195132991 has 2 divisors, whose sum is σ = 195132992. Its totient is φ = 195132990.

The previous prime is 195132937. The next prime is 195132997. The reversal of 195132991 is 199231591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195132991 - 2⁹ = 195132479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195132997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97566495 + 97566496.

It is an arithmetic number, because the mean of its divisors is an integer number (97566496).

Almost surely, 2^195132991 is an apocalyptic number.

195132991 is a deficient number, since it is larger than the sum of its proper divisors (1).

195132991 is an equidigital number, since it uses as much as digits as its factorization.

195132991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 40.

The square root of 195132991 is about 13969.0010738062. The cubic root of 195132991 is about 580.0207988974.

The spelling of 195132991 in words is "one hundred ninety-five million, one hundred thirty-two thousand, nine hundred ninety-one".