197877961 has 16 divisors (see below), whose sum is σ = 209561488. Its totient is φ = 186624000.

The previous prime is 197877949. The next prime is 197877971. The reversal of 197877961 is 169778791.

197877961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 31854736 + 166023225 = 5644^2 + 12885^2 .

It is a 4-Lehmer number, since φ(197877961) divides (197877961-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 197877961 - 2¹¹ = 197875913 is a prime.

Its product of digits (1333584) is a multiple of the sum of its prime divisors (1372).

It is not an unprimeable number, because it can be changed into a prime (197877941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164161 + ... + 165361.

It is an arithmetic number, because the mean of its divisors is an integer number (13097593).

Almost surely, 2^197877961 is an apocalyptic number.

It is an amenable number.

197877961 is a deficient number, since it is larger than the sum of its proper divisors (11683527).

197877961 is a wasteful number, since it uses less digits than its factorization.

197877961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372.

The product of its digits is 1333584, while the sum is 55.

The square root of 197877961 is about 14066.9101440224. The cubic root of 197877961 is about 582.7278959927.

The spelling of 197877961 in words is "one hundred ninety-seven million, eight hundred seventy-seven thousand, nine hundred sixty-one".