197561599 has 2 divisors, whose sum is σ = 197561600. Its totient is φ = 197561598.

The previous prime is 197561597. The next prime is 197561603. The reversal of 197561599 is 995165791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197561599 - 2¹ = 197561597 is a prime.

Together with 197561597, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197561593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98780799 + 98780800.

It is an arithmetic number, because the mean of its divisors is an integer number (98780800).

Almost surely, 2^197561599 is an apocalyptic number.

197561599 is a deficient number, since it is larger than the sum of its proper divisors (1).

197561599 is an equidigital number, since it uses as much as digits as its factorization.

197561599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 765450, while the sum is 52.

The square root of 197561599 is about 14055.6607457636. The cubic root of 197561599 is about 582.4171804128.

The spelling of 197561599 in words is "one hundred ninety-seven million, five hundred sixty-one thousand, five hundred ninety-nine".