195149081 has 2 divisors, whose sum is σ = 195149082. Its totient is φ = 195149080.

The previous prime is 195149051. The next prime is 195149083. The reversal of 195149081 is 180941591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163968025 + 31181056 = 12805^2 + 5584^2 .

It is a cyclic number.

It is not a de Polignac number, because 195149081 - 2²⁶ = 128040217 is a prime.

It is a super-2 number, since 2×195149081² = 76166327630289122, which contains 22 as substring.

Together with 195149083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195149083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97574540 + 97574541.

It is an arithmetic number, because the mean of its divisors is an integer number (97574541).

Almost surely, 2^195149081 is an apocalyptic number.

It is an amenable number.

195149081 is a deficient number, since it is larger than the sum of its proper divisors (1).

195149081 is an equidigital number, since it uses as much as digits as its factorization.

195149081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 195149081 is about 13969.5769799948. The cubic root of 195149081 is about 580.0367406373.

The spelling of 195149081 in words is "one hundred ninety-five million, one hundred forty-nine thousand, eighty-one".