145311321 has 16 divisors (see below), whose sum is σ = 199336448. Its totient is φ = 94089600.

The previous prime is 145311307. The next prime is 145311323. The reversal of 145311321 is 123113541.

It is not a de Polignac number, because 145311321 - 2⁵ = 145311289 is a prime.

It is a super-2 number, since 2×145311321² = 42230760021530082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145311323) 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, 109341 + ... + 110661.

It is an arithmetic number, because the mean of its divisors is an integer number (12458528).

Almost surely, 2^145311321 is an apocalyptic number.

It is an amenable number.

145311321 is a deficient number, since it is larger than the sum of its proper divisors (54025127).

145311321 is a wasteful number, since it uses less digits than its factorization.

145311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352.

The product of its digits is 360, while the sum is 21.

The square root of 145311321 is about 12054.5145485001. The cubic root of 145311321 is about 525.7345075002.

Adding to 145311321 its reverse (123113541), we get a palindrome (268424862).

The spelling of 145311321 in words is "one hundred forty-five million, three hundred eleven thousand, three hundred twenty-one".