16161231 has 4 divisors (see below), whose sum is σ = 21548312. Its totient is φ = 10774152.

The previous prime is 16161209. The next prime is 16161253. The reversal of 16161231 is 13216161.

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

It is an interprime number because it is at equal distance from previous prime (16161209) and next prime (16161253).

It is not a de Polignac number, because 16161231 - 2¹¹ = 16159183 is a prime.

It is a super-2 number, since 2×16161231² = 522370774870722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16161198 and 16161207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161031) 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, 2693536 + ... + 2693541.

It is an arithmetic number, because the mean of its divisors is an integer number (5387078).

Almost surely, 2^16161231 is an apocalyptic number.

16161231 is a deficient number, since it is larger than the sum of its proper divisors (5387081).

16161231 is an equidigital number, since it uses as much as digits as its factorization.

16161231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387080.

The product of its digits is 216, while the sum is 21.

The square root of 16161231 is about 4020.1033568803. The cubic root of 16161231 is about 252.8277924283.

Adding to 16161231 its reverse (13216161), we get a palindrome (29377392).

The spelling of 16161231 in words is "sixteen million, one hundred sixty-one thousand, two hundred thirty-one".