145241321 has 2 divisors, whose sum is σ = 145241322. Its totient is φ = 145241320.

The previous prime is 145241269. The next prime is 145241323. The reversal of 145241321 is 123142541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113656921 + 31584400 = 10661^2 + 5620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145241321 is a prime.

Together with 145241323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145241323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72620660 + 72620661.

It is an arithmetic number, because the mean of its divisors is an integer number (72620661).

Almost surely, 2^145241321 is an apocalyptic number.

It is an amenable number.

145241321 is a deficient number, since it is larger than the sum of its proper divisors (1).

145241321 is an equidigital number, since it uses as much as digits as its factorization.

145241321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 145241321 is about 12051.6107222230. The cubic root of 145241321 is about 525.6500742383.

Adding to 145241321 its reverse (123142541), we get a palindrome (268383862).

The spelling of 145241321 in words is "one hundred forty-five million, two hundred forty-one thousand, three hundred twenty-one".