145155321 has 24 divisors (see below), whose sum is σ = 218006880. Its totient is φ = 96515712.

The previous prime is 145155319. The next prime is 145155331. The reversal of 145155321 is 123551541.

It is not a de Polignac number, because 145155321 - 2¹ = 145155319 is a prime.

It is a super-2 number, since 2×145155321² = 42140134429226082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (145155301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155785 + ... + 156713.

It is an arithmetic number, because the mean of its divisors is an integer number (9083620).

Almost surely, 2^145155321 is an apocalyptic number.

It is an amenable number.

145155321 is a deficient number, since it is larger than the sum of its proper divisors (72851559).

145155321 is an frugal number, since it uses more digits than its factorization.

145155321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587 (or 1575 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 145155321 is about 12048.0422061014. The cubic root of 145155321 is about 525.5463047980.

The spelling of 145155321 in words is "one hundred forty-five million, one hundred fifty-five thousand, three hundred twenty-one".