197694881 has 4 divisors (see below), whose sum is σ = 197866032. Its totient is φ = 197523732.

The previous prime is 197694817. The next prime is 197694883. The reversal of 197694881 is 188496791.

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 not a de Polignac number, because 197694881 - 2⁶ = 197694817 is a prime.

It is a super-2 number, since 2×197694881² = 78166531947208322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197694883) 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 3 ways as a sum of consecutive naturals, for example, 83831 + ... + 86156.

It is an arithmetic number, because the mean of its divisors is an integer number (49466508).

Almost surely, 2^197694881 is an apocalyptic number.

It is an amenable number.

197694881 is a deficient number, since it is larger than the sum of its proper divisors (171151).

197694881 is a wasteful number, since it uses less digits than its factorization.

197694881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171150.

The product of its digits is 870912, while the sum is 53.

The square root of 197694881 is about 14060.4011678188. The cubic root of 197694881 is about 582.5481240058.

The spelling of 197694881 in words is "one hundred ninety-seven million, six hundred ninety-four thousand, eight hundred eighty-one".