161591853 has 4 divisors (see below), whose sum is σ = 215455808. Its totient is φ = 107727900.

The previous prime is 161591849. The next prime is 161591863. The reversal of 161591853 is 358195161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161591853 - 2² = 161591849 is a prime.

It is a super-2 number, since 2×161591853² = 52223853911947218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161591863) 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, 26931973 + ... + 26931978.

It is an arithmetic number, because the mean of its divisors is an integer number (53863952).

Almost surely, 2^161591853 is an apocalyptic number.

It is an amenable number.

161591853 is a deficient number, since it is larger than the sum of its proper divisors (53863955).

161591853 is an equidigital number, since it uses as much as digits as its factorization.

161591853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53863954.

The product of its digits is 32400, while the sum is 39.

The square root of 161591853 is about 12711.8784213821. The cubic root of 161591853 is about 544.6779827645.

The spelling of 161591853 in words is "one hundred sixty-one million, five hundred ninety-one thousand, eight hundred fifty-three".