195447881 has 2 divisors, whose sum is σ = 195447882. Its totient is φ = 195447880.

The previous prime is 195447841. The next prime is 195447953. The reversal of 195447881 is 188744591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177129481 + 18318400 = 13309^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 195447881 - 2¹⁸ = 195185737 is a prime.

It is a super-2 number, since 2×195447881² = 76399748374780322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195447841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97723940 + 97723941.

It is an arithmetic number, because the mean of its divisors is an integer number (97723941).

Almost surely, 2^195447881 is an apocalyptic number.

It is an amenable number.

195447881 is a deficient number, since it is larger than the sum of its proper divisors (1).

195447881 is an equidigital number, since it uses as much as digits as its factorization.

195447881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 47.

The square root of 195447881 is about 13980.2675582408. The cubic root of 195447881 is about 580.3326282668.

The spelling of 195447881 in words is "one hundred ninety-five million, four hundred forty-seven thousand, eight hundred eighty-one".