45381509 has 2 divisors, whose sum is σ = 45381510. Its totient is φ = 45381508.

The previous prime is 45381503. The next prime is 45381529. The reversal of 45381509 is 90518354.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31528225 + 13853284 = 5615^2 + 3722^2 .

It is a cyclic number.

It is not a de Polignac number, because 45381509 - 2⁴ = 45381493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45381503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22690754 + 22690755.

It is an arithmetic number, because the mean of its divisors is an integer number (22690755).

Almost surely, 2^45381509 is an apocalyptic number.

It is an amenable number.

45381509 is a deficient number, since it is larger than the sum of its proper divisors (1).

45381509 is an equidigital number, since it uses as much as digits as its factorization.

45381509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 45381509 is about 6736.5799186234. The cubic root of 45381509 is about 356.6916785480.

The spelling of 45381509 in words is "forty-five million, three hundred eighty-one thousand, five hundred nine".