161586521 has 16 divisors (see below), whose sum is σ = 170553600. Its totient is φ = 152880000.

The previous prime is 161586487. The next prime is 161586553. The reversal of 161586521 is 125685161.

It is a happy number.

161586521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161586521 - 2⁶ = 161586457 is a prime.

It is a super-2 number, since 2×161586521² = 52220407537766882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161586571) 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, 574901 + ... + 575181.

It is an arithmetic number, because the mean of its divisors is an integer number (10659600).

Almost surely, 2^161586521 is an apocalyptic number.

It is an amenable number.

161586521 is a deficient number, since it is larger than the sum of its proper divisors (8967079).

161586521 is a wasteful number, since it uses less digits than its factorization.

161586521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its digits is 14400, while the sum is 35.

The square root of 161586521 is about 12711.6686945499. The cubic root of 161586521 is about 544.6719918376.

The spelling of 161586521 in words is "one hundred sixty-one million, five hundred eighty-six thousand, five hundred twenty-one".