197493561 has 6 divisors (see below), whose sum is σ = 285268490. Its totient is φ = 131662368.

The previous prime is 197493559. The next prime is 197493589. The reversal of 197493561 is 165394791.

197493561 is a `hidden beast` number, since 19 + 74 + 9 + 3 + 561 = 666.

197493561 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 only one way, i.e., 178623225 + 18870336 = 13365^2 + 4344^2 .

It is not a de Polignac number, because 197493561 - 2¹ = 197493559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197493511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10971856 + ... + 10971873.

Almost surely, 2^197493561 is an apocalyptic number.

It is an amenable number.

197493561 is a deficient number, since it is larger than the sum of its proper divisors (87774929).

197493561 is a wasteful number, since it uses less digits than its factorization.

197493561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21943735 (or 21943732 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 197493561 is about 14053.2402313488. The cubic root of 197493561 is about 582.3503134201.

The spelling of 197493561 in words is "one hundred ninety-seven million, four hundred ninety-three thousand, five hundred sixty-one".