45081391 has 2 divisors, whose sum is σ = 45081392. Its totient is φ = 45081390.

The previous prime is 45081389. The next prime is 45081431. The reversal of 45081391 is 19318054.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 45081391 - 2¹ = 45081389 is a prime.

Together with 45081389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45081191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22540695 + 22540696.

It is an arithmetic number, because the mean of its divisors is an integer number (22540696).

Almost surely, 2^45081391 is an apocalyptic number.

45081391 is a deficient number, since it is larger than the sum of its proper divisors (1).

45081391 is an equidigital number, since it uses as much as digits as its factorization.

45081391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 45081391 is about 6714.2677188209. The cubic root of 45081391 is about 355.9036450714.

The spelling of 45081391 in words is "forty-five million, eighty-one thousand, three hundred ninety-one".