156321 has 12 divisors (see below), whose sum is σ = 246480. Its totient is φ = 94680.

The previous prime is 156319. The next prime is 156329. The reversal of 156321 is 123651.

It is not a de Polignac number, because 156321 - 2¹ = 156319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 156294 and 156303.

It is not an unprimeable number, because it can be changed into a prime (156329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 691 + ... + 888.

It is an arithmetic number, because the mean of its divisors is an integer number (20540).

2¹⁵⁶³²¹ is an apocalyptic number.

156321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156321 is a deficient number, since it is larger than the sum of its proper divisors (90159).

156321 is a wasteful number, since it uses less digits than its factorization.

156321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596 (or 1593 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 156321 is about 395.3745060066. The cubic root of 156321 is about 53.8690241415.

Adding to 156321 its reverse (123651), we get a palindrome (279972).

It can be divided in two parts, 1563 and 21, that multiplied together give a palindrome (32823).

The spelling of 156321 in words is "one hundred fifty-six thousand, three hundred twenty-one".