145133321 has 4 divisors (see below), whose sum is σ = 148221312. Its totient is φ = 142045332.

The previous prime is 145133309. The next prime is 145133347. The reversal of 145133321 is 123331541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145133321 - 2⁶ = 145133257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145153321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1543925 + ... + 1544018.

It is an arithmetic number, because the mean of its divisors is an integer number (37055328).

Almost surely, 2^145133321 is an apocalyptic number.

It is an amenable number.

145133321 is a deficient number, since it is larger than the sum of its proper divisors (3087991).

145133321 is an equidigital number, since it uses as much as digits as its factorization.

145133321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087990.

The product of its digits is 1080, while the sum is 23.

The square root of 145133321 is about 12047.1291600945. The cubic root of 145133321 is about 525.5197525440.

Adding to 145133321 its reverse (123331541), we get a palindrome (268464862).

The spelling of 145133321 in words is "one hundred forty-five million, one hundred thirty-three thousand, three hundred twenty-one".