195517291 has 2 divisors, whose sum is σ = 195517292. Its totient is φ = 195517290.

The previous prime is 195517249. The next prime is 195517307. The reversal of 195517291 is 192715591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195517291 - 2¹³ = 195509099 is a prime.

It is a super-2 number, since 2×195517291² = 76454022159957362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195517241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97758645 + 97758646.

It is an arithmetic number, because the mean of its divisors is an integer number (97758646).

Almost surely, 2^195517291 is an apocalyptic number.

195517291 is a deficient number, since it is larger than the sum of its proper divisors (1).

195517291 is an equidigital number, since it uses as much as digits as its factorization.

195517291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 40.

The square root of 195517291 is about 13982.7497653359. The cubic root of 195517291 is about 580.4013185661.

The spelling of 195517291 in words is "one hundred ninety-five million, five hundred seventeen thousand, two hundred ninety-one".