161329313 has 4 divisors (see below), whose sum is σ = 161420208. Its totient is φ = 161238420.

The previous prime is 161329307. The next prime is 161329331. The reversal of 161329313 is 313923161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 313923161 = 109 ⋅2880029.

It is a cyclic number.

It is not a de Polignac number, because 161329313 - 2¹⁰ = 161328289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161323313) 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, 42731 + ... + 46352.

It is an arithmetic number, because the mean of its divisors is an integer number (40355052).

Almost surely, 2^161329313 is an apocalyptic number.

It is an amenable number.

161329313 is a deficient number, since it is larger than the sum of its proper divisors (90895).

161329313 is an equidigital number, since it uses as much as digits as its factorization.

161329313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90894.

The product of its digits is 2916, while the sum is 29.

The square root of 161329313 is about 12701.5476616041. The cubic root of 161329313 is about 544.3828414990.

The spelling of 161329313 in words is "one hundred sixty-one million, three hundred twenty-nine thousand, three hundred thirteen".