195739881 has 16 divisors (see below), whose sum is σ = 275024640. Its totient is φ = 123489360.

The previous prime is 195739877. The next prime is 195739883. The reversal of 195739881 is 188937591.

195739881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 195739881 - 2² = 195739877 is a prime.

It is a super-2 number, since 2×195739881² = 76628202027788322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195739883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86146 + ... + 88388.

It is an arithmetic number, because the mean of its divisors is an integer number (17189040).

Almost surely, 2^195739881 is an apocalyptic number.

195739881 is the 8849-th centered pentagonal number.

It is an amenable number.

195739881 is a deficient number, since it is larger than the sum of its proper divisors (79284759).

195739881 is a wasteful number, since it uses less digits than its factorization.

195739881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796.

The product of its digits is 544320, while the sum is 51.

The square root of 195739881 is about 13990.7069514017. The cubic root of 195739881 is about 580.6214909663.

The spelling of 195739881 in words is "one hundred ninety-five million, seven hundred thirty-nine thousand, eight hundred eighty-one".