161444521 has 16 divisors (see below), whose sum is σ = 193536000. Its totient is φ = 131673168.

The previous prime is 161444509. The next prime is 161444603. The reversal of 161444521 is 125444161.

It is a cyclic number.

It is not a de Polignac number, because 161444521 - 2⁹ = 161444009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161444521.

It is not an unprimeable number, because it can be changed into a prime (161444021) 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, 29520 + ... + 34558.

It is an arithmetic number, because the mean of its divisors is an integer number (12096000).

Almost surely, 2^161444521 is an apocalyptic number.

It is an amenable number.

161444521 is a deficient number, since it is larger than the sum of its proper divisors (32091479).

161444521 is a wasteful number, since it uses less digits than its factorization.

161444521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268.

The product of its digits is 3840, while the sum is 28.

The square root of 161444521 is about 12706.0820475865. The cubic root of 161444521 is about 544.5123950067.

Adding to 161444521 its reverse (125444161), we get a palindrome (286888682).

The spelling of 161444521 in words is "one hundred sixty-one million, four hundred forty-four thousand, five hundred twenty-one".