195216681 has 12 divisors (see below), whose sum is σ = 286103216. Its totient is φ = 118312920.

The previous prime is 195216631. The next prime is 195216683. The reversal of 195216681 is 186612591.

It is not a de Polignac number, because 195216681 - 2⁹ = 195216169 is a prime.

It is a super-2 number, since 2×195216681² = 76219105081311522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195216683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268531 + ... + 269256.

Almost surely, 2^195216681 is an apocalyptic number.

195216681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

195216681 is a deficient number, since it is larger than the sum of its proper divisors (90886535).

195216681 is a wasteful number, since it uses less digits than its factorization.

195216681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537812 (or 537801 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 195216681 is about 13971.9963140562. The cubic root of 195216681 is about 580.1037081694.

The spelling of 195216681 in words is "one hundred ninety-five million, two hundred sixteen thousand, six hundred eighty-one".