161224553 has 12 divisors (see below), whose sum is σ = 187864020. Its totient is φ = 137958912.

The previous prime is 161224541. The next prime is 161224559. The reversal of 161224553 is 355422161.

161224553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 82937449 + 78287104 = 9107^2 + 8848^2 .

It is not a de Polignac number, because 161224553 - 2⁶ = 161224489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161224559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30533 + ... + 35421.

It is an arithmetic number, because the mean of its divisors is an integer number (15655335).

Almost surely, 2^161224553 is an apocalyptic number.

It is an amenable number.

161224553 is a deficient number, since it is larger than the sum of its proper divisors (26639467).

161224553 is an equidigital number, since it uses as much as digits as its factorization.

161224553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5576 (or 5569 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 161224553 is about 12697.4230850200. The cubic root of 161224553 is about 544.2649834069.

The spelling of 161224553 in words is "one hundred sixty-one million, two hundred twenty-four thousand, five hundred fifty-three".