161575851 has 32 divisors (see below), whose sum is σ = 230791680. Its totient is φ = 100331264.

The previous prime is 161575847. The next prime is 161575879. The reversal of 161575851 is 158575161.

It is a cyclic number.

It is not a de Polignac number, because 161575851 - 2² = 161575847 is a prime.

It is a super-2 number, since 2×161575851² = 52213511252748402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161575151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 509545 + ... + 509861.

It is an arithmetic number, because the mean of its divisors is an integer number (7212240).

Almost surely, 2^161575851 is an apocalyptic number.

161575851 is a deficient number, since it is larger than the sum of its proper divisors (69215829).

161575851 is a wasteful number, since it uses less digits than its factorization.

161575851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its digits is 42000, while the sum is 39.

The square root of 161575851 is about 12711.2489944930. The cubic root of 161575851 is about 544.6600028465.

The spelling of 161575851 in words is "one hundred sixty-one million, five hundred seventy-five thousand, eight hundred fifty-one".