195897881 has 4 divisors (see below), whose sum is σ = 197440512. Its totient is φ = 194355252.

The previous prime is 195897859. The next prime is 195897893. The reversal of 195897881 is 188798591.

195897881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195897881 is a prime.

It is a super-2 number, since 2×195897881² = 76751959560580322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195897841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771125 + ... + 771378.

It is an arithmetic number, because the mean of its divisors is an integer number (49360128).

Almost surely, 2^195897881 is an apocalyptic number.

It is an amenable number.

195897881 is a deficient number, since it is larger than the sum of its proper divisors (1542631).

195897881 is a wasteful number, since it uses less digits than its factorization.

195897881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542630.

The product of its digits is 1451520, while the sum is 56.

The square root of 195897881 is about 13996.3524176837. The cubic root of 195897881 is about 580.7776736217. Note that the first 3 decimals are identical.

The spelling of 195897881 in words is "one hundred ninety-five million, eight hundred ninety-seven thousand, eight hundred eighty-one".