161315311 has 4 divisors (see below), whose sum is σ = 161351352. Its totient is φ = 161279272.

The previous prime is 161315303. The next prime is 161315321. The reversal of 161315311 is 113513161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113513161 = 541 ⋅209821.

It is a cyclic number.

It is not a de Polignac number, because 161315311 - 2³ = 161315303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161315321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10165 + ... + 20638.

It is an arithmetic number, because the mean of its divisors is an integer number (40337838).

Almost surely, 2^161315311 is an apocalyptic number.

161315311 is a deficient number, since it is larger than the sum of its proper divisors (36041).

161315311 is an equidigital number, since it uses as much as digits as its factorization.

161315311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36040.

The product of its digits is 270, while the sum is 22.

The square root of 161315311 is about 12700.9964569714. The cubic root of 161315311 is about 544.3670917902.

Adding to 161315311 its reverse (113513161), we get a palindrome (274828472).

The spelling of 161315311 in words is "one hundred sixty-one million, three hundred fifteen thousand, three hundred eleven".