197561 has 12 divisors (see below), whose sum is σ = 245952. Its totient is φ = 155376.

The previous prime is 197551. The next prime is 197567. The reversal of 197561 is 165791.

It is a happy number.

197561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-197561 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1100 + ... + 1266.

It is an arithmetic number, because the mean of its divisors is an integer number (20496).

2¹⁹⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

197561 is a deficient number, since it is larger than the sum of its proper divisors (48391).

197561 is a wasteful number, since it uses less digits than its factorization.

197561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 187 counting only the distinct ones).

The product of its digits is 1890, while the sum is 29.

The square root of 197561 is about 444.4783459292. The cubic root of 197561 is about 58.2416591789.

The spelling of 197561 in words is "one hundred ninety-seven thousand, five hundred sixty-one".