195491953 has 2 divisors, whose sum is σ = 195491954. Its totient is φ = 195491952.

The previous prime is 195491951. The next prime is 195492041. The reversal of 195491953 is 359194591.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195356529 + 135424 = 13977^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 195491953 - 2¹ = 195491951 is a prime.

Together with 195491951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (195491951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97745976 + 97745977.

It is an arithmetic number, because the mean of its divisors is an integer number (97745977).

Almost surely, 2^195491953 is an apocalyptic number.

It is an amenable number.

195491953 is a deficient number, since it is larger than the sum of its proper divisors (1).

195491953 is an equidigital number, since it uses as much as digits as its factorization.

195491953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 218700, while the sum is 46.

The square root of 195491953 is about 13981.8436910159. The cubic root of 195491953 is about 580.3762451760.

The spelling of 195491953 in words is "one hundred ninety-five million, four hundred ninety-one thousand, nine hundred fifty-three".