195827381 has 2 divisors, whose sum is σ = 195827382. Its totient is φ = 195827380.

The previous prime is 195827377. The next prime is 195827407. The reversal of 195827381 is 183728591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137686756 + 58140625 = 11734^2 + 7625^2 .

It is an emirp because it is prime and its reverse (183728591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195827381 - 2² = 195827377 is a prime.

It is a super-2 number, since 2×195827381² = 76696726298638322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195827311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97913690 + 97913691.

It is an arithmetic number, because the mean of its divisors is an integer number (97913691).

Almost surely, 2^195827381 is an apocalyptic number.

It is an amenable number.

195827381 is a deficient number, since it is larger than the sum of its proper divisors (1).

195827381 is an equidigital number, since it uses as much as digits as its factorization.

195827381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 44.

The square root of 195827381 is about 13993.8336777311. The cubic root of 195827381 is about 580.7079949052.

The spelling of 195827381 in words is "one hundred ninety-five million, eight hundred twenty-seven thousand, three hundred eighty-one".