195511 has 2 divisors, whose sum is σ = 195512. Its totient is φ = 195510.

The previous prime is 195497. The next prime is 195527. The reversal of 195511 is 115591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195511 - 2⁵ = 195479 is a prime.

It is a super-2 number, since 2×195511² = 76449102242, which contains 22 as substring.

It is a Chen prime.

195511 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97755 + 97756.

It is an arithmetic number, because the mean of its divisors is an integer number (97756).

2¹⁹⁵⁵¹¹ is an apocalyptic number.

195511 is a deficient number, since it is larger than the sum of its proper divisors (1).

195511 is an equidigital number, since it uses as much as digits as its factorization.

195511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225, while the sum is 22.

The square root of 195511 is about 442.1662583237. The cubic root of 195511 is about 58.0395093466.

The spelling of 195511 in words is "one hundred ninety-five thousand, five hundred eleven".