195779149 has 2 divisors, whose sum is σ = 195779150. Its totient is φ = 195779148.

The previous prime is 195779113. The next prime is 195779153. The reversal of 195779149 is 941977591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195720100 + 59049 = 13990^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 195779149 - 2⁹ = 195778637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195779096 and 195779105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195779179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97889574 + 97889575.

It is an arithmetic number, because the mean of its divisors is an integer number (97889575).

Almost surely, 2^195779149 is an apocalyptic number.

It is an amenable number.

195779149 is a deficient number, since it is larger than the sum of its proper divisors (1).

195779149 is an equidigital number, since it uses as much as digits as its factorization.

195779149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 52.

The square root of 195779149 is about 13992.1102411323. The cubic root of 195779149 is about 580.6603151448.

The spelling of 195779149 in words is "one hundred ninety-five million, seven hundred seventy-nine thousand, one hundred forty-nine".