45218813 has 4 divisors (see below), whose sum is σ = 45251388. Its totient is φ = 45186240.

The previous prime is 45218809. The next prime is 45218819. The reversal of 45218813 is 31881254.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36445369 + 8773444 = 6037^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 45218813 - 2² = 45218809 is a prime.

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 45218813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45218819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14108 + ... + 17013.

It is an arithmetic number, because the mean of its divisors is an integer number (11312847).

Almost surely, 2^45218813 is an apocalyptic number.

It is an amenable number.

45218813 is a deficient number, since it is larger than the sum of its proper divisors (32575).

45218813 is a wasteful number, since it uses less digits than its factorization.

45218813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32574.

The product of its digits is 7680, while the sum is 32.

The square root of 45218813 is about 6724.4935125257. The cubic root of 45218813 is about 356.2649129696.

The spelling of 45218813 in words is "forty-five million, two hundred eighteen thousand, eight hundred thirteen".