161535321 has 12 divisors (see below), whose sum is σ = 245609520. Its totient is φ = 102022200.

The previous prime is 161535301. The next prime is 161535323. The reversal of 161535321 is 123535161.

It is not a de Polignac number, because 161535321 - 2¹⁴ = 161518937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161535323) 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 11 ways as a sum of consecutive naturals, for example, 472155 + ... + 472496.

It is an arithmetic number, because the mean of its divisors is an integer number (20467460).

Almost surely, 2^161535321 is an apocalyptic number.

It is an amenable number.

161535321 is a deficient number, since it is larger than the sum of its proper divisors (84074199).

161535321 is a wasteful number, since it uses less digits than its factorization.

161535321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944676 (or 944673 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 161535321 is about 12709.6546373220. The cubic root of 161535321 is about 544.6144578474.

The spelling of 161535321 in words is "one hundred sixty-one million, five hundred thirty-five thousand, three hundred twenty-one".