161842197 has 16 divisors (see below), whose sum is σ = 240417792. Its totient is φ = 95998320.

The previous prime is 161842189. The next prime is 161842201. The reversal of 161842197 is 791248161.

It is not a de Polignac number, because 161842197 - 2³ = 161842189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161842297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50623 + ... + 53724.

It is an arithmetic number, because the mean of its divisors is an integer number (15026112).

Almost surely, 2^161842197 is an apocalyptic number.

It is an amenable number.

161842197 is a deficient number, since it is larger than the sum of its proper divisors (78575595).

161842197 is a wasteful number, since it uses less digits than its factorization.

161842197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104408.

The product of its digits is 24192, while the sum is 39.

The square root of 161842197 is about 12721.7214637014. The cubic root of 161842197 is about 544.9591159747.

It can be divided in two parts, 16184 and 2197, that added together give a palindrome (18381).

The spelling of 161842197 in words is "one hundred sixty-one million, eight hundred forty-two thousand, one hundred ninety-seven".