161243133 has 16 divisors (see below), whose sum is σ = 225484800. Its totient is φ = 102296304.

The previous prime is 161243129. The next prime is 161243143. The reversal of 161243133 is 331342161.

It is a happy number.

It is not a de Polignac number, because 161243133 - 2² = 161243129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161243143) 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 15 ways as a sum of consecutive naturals, for example, 7860 + ... + 19602.

It is an arithmetic number, because the mean of its divisors is an integer number (14092800).

Almost surely, 2^161243133 is an apocalyptic number.

It is an amenable number.

161243133 is a deficient number, since it is larger than the sum of its proper divisors (64241667).

161243133 is a wasteful number, since it uses less digits than its factorization.

161243133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11968.

The product of its digits is 1296, while the sum is 24.

The square root of 161243133 is about 12698.1547084606. The cubic root of 161243133 is about 544.2858901790.

Adding to 161243133 its reverse (331342161), we get a palindrome (492585294).

The spelling of 161243133 in words is "one hundred sixty-one million, two hundred forty-three thousand, one hundred thirty-three".