45855581 has 2 divisors, whose sum is σ = 45855582. Its totient is φ = 45855580.

The previous prime is 45855571. The next prime is 45855611. The reversal of 45855581 is 18555854.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40119556 + 5736025 = 6334^2 + 2395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45855581 is a prime.

It is a super-2 number, since 2×45855581² = 4205468617695122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45855521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22927790 + 22927791.

It is an arithmetic number, because the mean of its divisors is an integer number (22927791).

Almost surely, 2^45855581 is an apocalyptic number.

It is an amenable number.

45855581 is a deficient number, since it is larger than the sum of its proper divisors (1).

45855581 is an equidigital number, since it uses as much as digits as its factorization.

45855581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160000, while the sum is 41.

The square root of 45855581 is about 6771.6749035966. The cubic root of 45855581 is about 357.9294228504.

It can be divided in two parts, 4 and 5855581, that added together give a palindrome (5855585).

The spelling of 45855581 in words is "forty-five million, eight hundred fifty-five thousand, five hundred eighty-one".