161216133 has 16 divisors (see below), whose sum is σ = 239473920. Its totient is φ = 95788224.

The previous prime is 161216119. The next prime is 161216149. The reversal of 161216133 is 331612161.

It is not a de Polignac number, because 161216133 - 2²⁵ = 127661701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161216173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70141 + ... + 72402.

It is an arithmetic number, because the mean of its divisors is an integer number (14967120).

Almost surely, 2^161216133 is an apocalyptic number.

161216133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161216133 is a deficient number, since it is larger than the sum of its proper divisors (78257787).

161216133 is a wasteful number, since it uses less digits than its factorization.

161216133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142588.

The product of its digits is 648, while the sum is 24.

The square root of 161216133 is about 12697.0915173515. The cubic root of 161216133 is about 544.2555084420.

Adding to 161216133 its reverse (331612161), we get a palindrome (492828294).

The spelling of 161216133 in words is "one hundred sixty-one million, two hundred sixteen thousand, one hundred thirty-three".