45778181 has 4 divisors (see below), whose sum is σ = 46894764. Its totient is φ = 44661600.

The previous prime is 45778177. The next prime is 45778189. The reversal of 45778181 is 18187754.

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 24700900 + 21077281 = 4970^2 + 4591^2 .

It is a cyclic number.

It is not a de Polignac number, because 45778181 - 2² = 45778177 is a prime.

It is a super-2 number, since 2×45778181² = 4191283711337522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1116541 = 45778181 / (4 + 5 + 7 + 7 + 8 + 1 + 8 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45778189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558230 + ... + 558311.

It is an arithmetic number, because the mean of its divisors is an integer number (11723691).

Almost surely, 2^45778181 is an apocalyptic number.

45778181 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

45778181 is a deficient number, since it is larger than the sum of its proper divisors (1116583).

45778181 is a wasteful number, since it uses less digits than its factorization.

45778181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116582.

The product of its digits is 62720, while the sum is 41.

The square root of 45778181 is about 6765.9575079955. The cubic root of 45778181 is about 357.7279254647.

The spelling of 45778181 in words is "forty-five million, seven hundred seventy-eight thousand, one hundred eighty-one".