145324321 has 2 divisors, whose sum is σ = 145324322. Its totient is φ = 145324320.

The previous prime is 145324303. The next prime is 145324337. The reversal of 145324321 is 123423541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145323025 + 1296 = 12055^2 + 36^2 .

It is an emirp because it is prime and its reverse (123423541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145324321 - 2²¹ = 143227169 is a prime.

It is a super-2 number, since 2×145324321² = 42238316548222082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145324301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72662160 + 72662161.

It is an arithmetic number, because the mean of its divisors is an integer number (72662161).

Almost surely, 2^145324321 is an apocalyptic number.

It is an amenable number.

145324321 is a deficient number, since it is larger than the sum of its proper divisors (1).

145324321 is an equidigital number, since it uses as much as digits as its factorization.

145324321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 145324321 is about 12055.0537535094. The cubic root of 145324321 is about 525.7501849775.

Adding to 145324321 its reverse (123423541), we get a palindrome (268747862).

The spelling of 145324321 in words is "one hundred forty-five million, three hundred twenty-four thousand, three hundred twenty-one".