161144521 has 4 divisors (see below), whose sum is σ = 164892112. Its totient is φ = 157396932.

The previous prime is 161144471. The next prime is 161144527. The reversal of 161144521 is 125441161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161144521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161144527) 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, 1873731 + ... + 1873816.

It is an arithmetic number, because the mean of its divisors is an integer number (41223028).

Almost surely, 2^161144521 is an apocalyptic number.

It is an amenable number.

161144521 is a deficient number, since it is larger than the sum of its proper divisors (3747591).

161144521 is an equidigital number, since it uses as much as digits as its factorization.

161144521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747590.

The product of its digits is 960, while the sum is 25.

The square root of 161144521 is about 12694.2711882171. The cubic root of 161144521 is about 544.1749106402.

Adding to 161144521 its reverse (125441161), we get a palindrome (286585682).

The spelling of 161144521 in words is "one hundred sixty-one million, one hundred forty-four thousand, five hundred twenty-one".