161131533 has 16 divisors (see below), whose sum is σ = 226475520. Its totient is φ = 101620656.

The previous prime is 161131519. The next prime is 161131543. The reversal of 161131533 is 335131161.

It is not a de Polignac number, because 161131533 - 2¹⁰ = 161130509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161131543) 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 15 ways as a sum of consecutive naturals, for example, 48966 + ... + 52152.

It is an arithmetic number, because the mean of its divisors is an integer number (14154720).

Almost surely, 2^161131533 is an apocalyptic number.

It is an amenable number.

161131533 is a deficient number, since it is larger than the sum of its proper divisors (65343987).

161131533 is a wasteful number, since it uses less digits than its factorization.

161131533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096.

The product of its digits is 810, while the sum is 24.

The square root of 161131533 is about 12693.7596085636. The cubic root of 161131533 is about 544.1602903611.

Adding to 161131533 its reverse (335131161), we get a palindrome (496262694).

The spelling of 161131533 in words is "one hundred sixty-one million, one hundred thirty-one thousand, five hundred thirty-three".