161957875 has 16 divisors (see below), whose sum is σ = 204029280. Its totient is φ = 128344800.

The previous prime is 161957833. The next prime is 161957897. The reversal of 161957875 is 578759161.

It is a happy number.

It is not a de Polignac number, because 161957875 - 2¹⁷ = 161826803 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7321 + ... + 19429.

It is an arithmetic number, because the mean of its divisors is an integer number (12751830).

Almost surely, 2^161957875 is an apocalyptic number.

161957875 is a deficient number, since it is larger than the sum of its proper divisors (42071405).

161957875 is a wasteful number, since it uses less digits than its factorization.

161957875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12231 (or 12221 counting only the distinct ones).

The product of its digits is 529200, while the sum is 49.

The square root of 161957875 is about 12726.2671274809. The cubic root of 161957875 is about 545.0889230097.

The spelling of 161957875 in words is "one hundred sixty-one million, nine hundred fifty-seven thousand, eight hundred seventy-five".