145321 has 6 divisors (see below), whose sum is σ = 159866. Its totient is φ = 132000.

The previous prime is 145307. The next prime is 145349. The reversal of 145321 is 123541.

It can be written as a sum of positive squares in only one way, i.e., 75625 + 69696 = 275^2 + 264^2 .

It is not a de Polignac number, because 145321 - 2⁵ = 145289 is a prime.

It is a super-2 number, since 2×145321² = 42236386082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145295 and 145304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 480 + ... + 721.

2¹⁴⁵³²¹ is an apocalyptic number.

145321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145321 is a deficient number, since it is larger than the sum of its proper divisors (14545).

145321 is a wasteful number, since it uses less digits than its factorization.

145321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223 (or 1212 counting only the distinct ones).

The product of its digits is 120, while the sum is 16.

The square root of 145321 is about 381.2099159256. The cubic root of 145321 is about 52.5746180074.

Adding to 145321 its reverse (123541), we get a palindrome (268862).

It can be divided in two parts, 14 and 5321, that added together give a palindrome (5335).

The spelling of 145321 in words is "one hundred forty-five thousand, three hundred twenty-one".