197995681 has 8 divisors (see below), whose sum is σ = 216840960. Its totient is φ = 179666832.

The previous prime is 197995669. The next prime is 197995703. The reversal of 197995681 is 186599791.

197995681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 5745-th star number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197995681 - 2⁵ = 197995649 is a prime.

It is a super-2 number, since 2×197995681² = 78404579389307522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197995781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128305 + ... + 129838.

It is an arithmetic number, because the mean of its divisors is an integer number (27105120).

Almost surely, 2^197995681 is an apocalyptic number.

It is an amenable number.

197995681 is a deficient number, since it is larger than the sum of its proper divisors (18845279).

197995681 is a wasteful number, since it uses less digits than its factorization.

197995681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258215.

The product of its digits is 1224720, while the sum is 55.

The square root of 197995681 is about 14071.0938096510. The cubic root of 197995681 is about 582.8434303834.

The spelling of 197995681 in words is "one hundred ninety-seven million, nine hundred ninety-five thousand, six hundred eighty-one".