45581821 has 2 divisors, whose sum is σ = 45581822. Its totient is φ = 45581820.

The previous prime is 45581803. The next prime is 45581863. The reversal of 45581821 is 12818554.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45562500 + 19321 = 6750^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 45581821 - 2⁹ = 45581309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45581021) 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, 22790910 + 22790911.

It is an arithmetic number, because the mean of its divisors is an integer number (22790911).

Almost surely, 2^45581821 is an apocalyptic number.

It is an amenable number.

45581821 is a deficient number, since it is larger than the sum of its proper divisors (1).

45581821 is an equidigital number, since it uses as much as digits as its factorization.

45581821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 34.

The square root of 45581821 is about 6751.4310334921. The cubic root of 45581821 is about 357.2157154442.

The spelling of 45581821 in words is "forty-five million, five hundred eighty-one thousand, eight hundred twenty-one".