195181957 has 2 divisors, whose sum is σ = 195181958. Its totient is φ = 195181956.

The previous prime is 195181951. The next prime is 195181997. The reversal of 195181957 is 759181591.

195181957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160123716 + 35058241 = 12654^2 + 5921^2 .

It is a cyclic number.

It is not a de Polignac number, because 195181957 - 2¹⁹ = 194657669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195181951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97590978 + 97590979.

It is an arithmetic number, because the mean of its divisors is an integer number (97590979).

Almost surely, 2^195181957 is an apocalyptic number.

It is an amenable number.

195181957 is a deficient number, since it is larger than the sum of its proper divisors (1).

195181957 is an equidigital number, since it uses as much as digits as its factorization.

195181957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 46.

The square root of 195181957 is about 13970.7536303522. The cubic root of 195181957 is about 580.0693109797.

The spelling of 195181957 in words is "one hundred ninety-five million, one hundred eighty-one thousand, nine hundred fifty-seven".