161560259 has 4 divisors (see below), whose sum is σ = 184640304. Its totient is φ = 138480216.

The previous prime is 161560237. The next prime is 161560277. The reversal of 161560259 is 952065161.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-161560259 is a prime.

It is a super-2 number, since 2×161560259² = 52203434576294162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161565259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11540012 + ... + 11540025.

It is an arithmetic number, because the mean of its divisors is an integer number (46160076).

Almost surely, 2^161560259 is an apocalyptic number.

161560259 is a deficient number, since it is larger than the sum of its proper divisors (23080045).

161560259 is an equidigital number, since it uses as much as digits as its factorization.

161560259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23080044.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 161560259 is about 12710.6356646707. The cubic root of 161560259 is about 544.6424824644.

The spelling of 161560259 in words is "one hundred sixty-one million, five hundred sixty thousand, two hundred fifty-nine".