45045781 has 4 divisors (see below), whose sum is σ = 49140864. Its totient is φ = 40950700.

The previous prime is 45045773. The next prime is 45045797. The reversal of 45045781 is 18754054.

45045781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45045781 - 2³ = 45045773 is a prime.

It is a super-2 number, since 2×45045781² = 4058244771799922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45045701) 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 in 3 ways as a sum of consecutive naturals, for example, 2047525 + ... + 2047546.

It is an arithmetic number, because the mean of its divisors is an integer number (12285216).

Almost surely, 2^45045781 is an apocalyptic number.

It is an amenable number.

45045781 is a deficient number, since it is larger than the sum of its proper divisors (4095083).

45045781 is a wasteful number, since it uses less digits than its factorization.

45045781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095082.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 45045781 is about 6711.6153793256. The cubic root of 45045781 is about 355.8099104061.

The spelling of 45045781 in words is "forty-five million, forty-five thousand, seven hundred eighty-one".