197974861 has 4 divisors (see below), whose sum is σ = 226256992. Its totient is φ = 169692732.

The previous prime is 197974859. The next prime is 197974867. The reversal of 197974861 is 168479791.

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 197974861 - 2¹ = 197974859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197974799 and 197974808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197974867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14141055 + ... + 14141068.

It is an arithmetic number, because the mean of its divisors is an integer number (56564248).

Almost surely, 2^197974861 is an apocalyptic number.

It is an amenable number.

197974861 is a deficient number, since it is larger than the sum of its proper divisors (28282131).

197974861 is an equidigital number, since it uses as much as digits as its factorization.

197974861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28282130.

The product of its digits is 762048, while the sum is 52.

The square root of 197974861 is about 14070.3539756468. The cubic root of 197974861 is about 582.8230002651.

The spelling of 197974861 in words is "one hundred ninety-seven million, nine hundred seventy-four thousand, eight hundred sixty-one".