45421781 has 2 divisors, whose sum is σ = 45421782. Its totient is φ = 45421780.

The previous prime is 45421771. The next prime is 45421793. The reversal of 45421781 is 18712454.

It is a happy number.

45421781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 128881 = 6730^2 + 359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45421781 is a prime.

It is a super-2 number, since 2×45421781² = 4126276378423922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45421721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22710890 + 22710891.

It is an arithmetic number, because the mean of its divisors is an integer number (22710891).

Almost surely, 2^45421781 is an apocalyptic number.

It is an amenable number.

45421781 is a deficient number, since it is larger than the sum of its proper divisors (1).

45421781 is an equidigital number, since it uses as much as digits as its factorization.

45421781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 45421781 is about 6739.5683096175. The cubic root of 45421781 is about 356.7971579276.

The spelling of 45421781 in words is "forty-five million, four hundred twenty-one thousand, seven hundred eighty-one".