145304581 has 2 divisors, whose sum is σ = 145304582. Its totient is φ = 145304580.

The previous prime is 145304563. The next prime is 145304617. The reversal of 145304581 is 185403541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120802081 + 24502500 = 10991^2 + 4950^2 .

It is an emirp because it is prime and its reverse (185403541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145304581 - 2¹⁵ = 145271813 is a prime.

It is a super-2 number, since 2×145304581² = 42226842519171122, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145304681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72652290 + 72652291.

It is an arithmetic number, because the mean of its divisors is an integer number (72652291).

Almost surely, 2^145304581 is an apocalyptic number.

It is an amenable number.

145304581 is a deficient number, since it is larger than the sum of its proper divisors (1).

145304581 is an equidigital number, since it uses as much as digits as its factorization.

145304581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 145304581 is about 12054.2349819472. The cubic root of 145304581 is about 525.7263789632.

The spelling of 145304581 in words is "one hundred forty-five million, three hundred four thousand, five hundred eighty-one".