197801881 has 4 divisors (see below), whose sum is σ = 197859600. Its totient is φ = 197744164.

The previous prime is 197801873. The next prime is 197801893. The reversal of 197801881 is 188108791.

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 197801881 - 2³ = 197801873 is a prime.

It is a super-2 number, since 2×197801881² = 78251168254276322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197801831) 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, 23371 + ... + 30688.

It is an arithmetic number, because the mean of its divisors is an integer number (49464900).

Almost surely, 2^197801881 is an apocalyptic number.

It is an amenable number.

197801881 is a deficient number, since it is larger than the sum of its proper divisors (57719).

197801881 is an equidigital number, since it uses as much as digits as its factorization.

197801881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57718.

The product of its (nonzero) digits is 32256, while the sum is 43.

The square root of 197801881 is about 14064.2056654473. The cubic root of 197801881 is about 582.6532041285.

The spelling of 197801881 in words is "one hundred ninety-seven million, eight hundred one thousand, eight hundred eighty-one".