145255321 has 4 divisors (see below), whose sum is σ = 145534644. Its totient is φ = 144976000.

The previous prime is 145255291. The next prime is 145255337. The reversal of 145255321 is 123552541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95355225 + 49900096 = 9765^2 + 7064^2 .

It is a cyclic number.

It is not a de Polignac number, because 145255321 - 2⁷ = 145255193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145255321.

It is not an unprimeable number, because it can be changed into a prime (145250321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138880 + ... + 139921.

It is an arithmetic number, because the mean of its divisors is an integer number (36383661).

Almost surely, 2^145255321 is an apocalyptic number.

It is an amenable number.

145255321 is a deficient number, since it is larger than the sum of its proper divisors (279323).

145255321 is an equidigital number, since it uses as much as digits as its factorization.

145255321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279322.

The product of its digits is 6000, while the sum is 28.

The square root of 145255321 is about 12052.1915434497. The cubic root of 145255321 is about 525.6669630606. Note that the first 3 decimals are identical.

The spelling of 145255321 in words is "one hundred forty-five million, two hundred fifty-five thousand, three hundred twenty-one".