197561601 has 24 divisors (see below), whose sum is σ = 310752000. Its totient is φ = 120470112.

The previous prime is 197561599. The next prime is 197561603. The reversal of 197561601 is 106165791.

It is a happy number.

197561601 is a `hidden beast` number, since 1 + 97 + 561 + 6 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (197561599) and next prime (197561603).

It is not a de Polignac number, because 197561601 - 2¹ = 197561599 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197561603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14961 + ... + 24878.

It is an arithmetic number, because the mean of its divisors is an integer number (12948000).

Almost surely, 2^197561601 is an apocalyptic number.

It is an amenable number.

197561601 is a deficient number, since it is larger than the sum of its proper divisors (113190399).

197561601 is a wasteful number, since it uses less digits than its factorization.

197561601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39893 (or 39890 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 197561601 is about 14055.6608169093. The cubic root of 197561601 is about 582.4171823781.

The spelling of 197561601 in words is "one hundred ninety-seven million, five hundred sixty-one thousand, six hundred one".