45381818 has 4 divisors (see below), whose sum is σ = 68072730. Its totient is φ = 22690908.

The previous prime is 45381811. The next prime is 45381841. The reversal of 45381818 is 81818354.

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

It can be written as a sum of positive squares in only one way, i.e., 29084449 + 16297369 = 5393^2 + 4037^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45381811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11345453 + ... + 11345456.

Almost surely, 2^45381818 is an apocalyptic number.

45381818 is a deficient number, since it is larger than the sum of its proper divisors (22690912).

45381818 is a wasteful number, since it uses less digits than its factorization.

45381818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22690911.

The product of its digits is 30720, while the sum is 38.

The square root of 45381818 is about 6736.6028530707. The cubic root of 45381818 is about 356.6924881103.

The spelling of 45381818 in words is "forty-five million, three hundred eighty-one thousand, eight hundred eighteen".