45139909 has 2 divisors, whose sum is σ = 45139910. Its totient is φ = 45139908.

The previous prime is 45139867. The next prime is 45139943. The reversal of 45139909 is 90993154.

45139909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31472100 + 13667809 = 5610^2 + 3697^2 .

It is a cyclic number.

It is not a de Polignac number, because 45139909 - 2⁷ = 45139781 is a prime.

It is a super-2 number, since 2×45139909² = 4075222769056562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45139309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22569954 + 22569955.

It is an arithmetic number, because the mean of its divisors is an integer number (22569955).

Almost surely, 2^45139909 is an apocalyptic number.

It is an amenable number.

45139909 is a deficient number, since it is larger than the sum of its proper divisors (1).

45139909 is an equidigital number, since it uses as much as digits as its factorization.

45139909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 45139909 is about 6718.6240406798. The cubic root of 45139909 is about 356.0575723284.

The spelling of 45139909 in words is "forty-five million, one hundred thirty-nine thousand, nine hundred nine".