195933981 has 16 divisors (see below), whose sum is σ = 276965888. Its totient is φ = 122990400.

The previous prime is 195933979. The next prime is 195933989. The reversal of 195933981 is 189339591.

It is not a de Polignac number, because 195933981 - 2¹ = 195933979 is a prime.

It is a super-2 number, since 2×195933981² = 76780249821016722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 195933981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195933989) 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, 25030 + ... + 31911.

It is an arithmetic number, because the mean of its divisors is an integer number (17310368).

Almost surely, 2^195933981 is an apocalyptic number.

It is an amenable number.

195933981 is a deficient number, since it is larger than the sum of its proper divisors (81031907).

195933981 is a wasteful number, since it uses less digits than its factorization.

195933981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57012.

The product of its digits is 262440, while the sum is 48.

The square root of 195933981 is about 13997.6419799908. The cubic root of 195933981 is about 580.8133466063.

The spelling of 195933981 in words is "one hundred ninety-five million, nine hundred thirty-three thousand, nine hundred eighty-one".