197520161 has 8 divisors (see below), whose sum is σ = 210668040. Its totient is φ = 184542208.

The previous prime is 197520151. The next prime is 197520187. The reversal of 197520161 is 161025791.

It can be written as a sum of positive squares in 4 ways, for example, as 22619536 + 174900625 = 4756^2 + 13225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 197520161 - 2¹⁰ = 197519137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197520121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40076 + ... + 44733.

It is an arithmetic number, because the mean of its divisors is an integer number (26333505).

Almost surely, 2^197520161 is an apocalyptic number.

It is an amenable number.

197520161 is a deficient number, since it is larger than the sum of its proper divisors (13147879).

197520161 is a wasteful number, since it uses less digits than its factorization.

197520161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84963.

The product of its (nonzero) digits is 3780, while the sum is 32.

The square root of 197520161 is about 14054.1866004405. The cubic root of 197520161 is about 582.3764574336.

The spelling of 197520161 in words is "one hundred ninety-seven million, five hundred twenty thousand, one hundred sixty-one".