161590 has 32 divisors (see below), whose sum is σ = 344736. Its totient is φ = 53760.

The previous prime is 161573. The next prime is 161591. The reversal of 161590 is 95161.

It is a super-2 number, since 2×161590² = 52222656200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1374 + ... + 1486.

It is an arithmetic number, because the mean of its divisors is an integer number (10773).

2¹⁶¹⁵⁹⁰ is an apocalyptic number.

161590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161590 is an abundant number, since it is smaller than the sum of its proper divisors (183146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161590 is a wasteful number, since it uses less digits than its factorization.

161590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 161590 is about 401.9825866875. The cubic root of 161590 is about 54.4675900786.

The spelling of 161590 in words is "one hundred sixty-one thousand, five hundred ninety".