45165781 has 4 divisors (see below), whose sum is σ = 46216192. Its totient is φ = 44115372.

The previous prime is 45165773. The next prime is 45165871. The reversal of 45165781 is 18756154.

45165781 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 45165781 - 2³ = 45165773 is a prime.

It is a super-2 number, since 2×45165781² = 4079895546679922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 45165781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45165581) 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, 525141 + ... + 525226.

It is an arithmetic number, because the mean of its divisors is an integer number (11554048).

Almost surely, 2^45165781 is an apocalyptic number.

It is an amenable number.

45165781 is a deficient number, since it is larger than the sum of its proper divisors (1050411).

45165781 is a wasteful number, since it uses less digits than its factorization.

45165781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050410.

The product of its digits is 33600, while the sum is 37.

The square root of 45165781 is about 6720.5491591089. The cubic root of 45165781 is about 356.1255842964.

The spelling of 45165781 in words is "forty-five million, one hundred sixty-five thousand, seven hundred eighty-one".