145425321 has 8 divisors (see below), whose sum is σ = 215444960. Its totient is φ = 96950196.

The previous prime is 145425311. The next prime is 145425323. The reversal of 145425321 is 123524541.

It is not a de Polignac number, because 145425321 - 2⁶ = 145425257 is a prime.

It is a super-2 number, since 2×145425321² = 42297047975906082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5386123 = 145425321 / (1 + 4 + 5 + 4 + 2 + 5 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145425323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2693035 + ... + 2693088.

It is an arithmetic number, because the mean of its divisors is an integer number (26930620).

Almost surely, 2^145425321 is an apocalyptic number.

It is an amenable number.

145425321 is a deficient number, since it is larger than the sum of its proper divisors (70019639).

145425321 is an equidigital number, since it uses as much as digits as its factorization.

145425321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5386132 (or 5386126 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 145425321 is about 12059.2421403669. The cubic root of 145425321 is about 525.8719550786.

Adding to 145425321 its reverse (123524541), we get a palindrome (268949862).

The spelling of 145425321 in words is "one hundred forty-five million, four hundred twenty-five thousand, three hundred twenty-one".