161234311 has 4 divisors (see below), whose sum is σ = 184267792. Its totient is φ = 138200832.

The previous prime is 161234309. The next prime is 161234329. The reversal of 161234311 is 113432161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113432161 = 59 ⋅1922579.

It is not a de Polignac number, because 161234311 - 2¹ = 161234309 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 (161234351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11516730 + ... + 11516743.

It is an arithmetic number, because the mean of its divisors is an integer number (46066948).

Almost surely, 2^161234311 is an apocalyptic number.

161234311 is a deficient number, since it is larger than the sum of its proper divisors (23033481).

161234311 is an equidigital number, since it uses as much as digits as its factorization.

161234311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23033480.

The product of its digits is 432, while the sum is 22.

The square root of 161234311 is about 12697.8073304016. The cubic root of 161234311 is about 544.2759636008.

Adding to 161234311 its reverse (113432161), we get a palindrome (274666472).

The spelling of 161234311 in words is "one hundred sixty-one million, two hundred thirty-four thousand, three hundred eleven".