45781681 has 6 divisors (see below), whose sum is σ = 50322146. Its totient is φ = 41619600.

The previous prime is 45781669. The next prime is 45781709. The reversal of 45781681 is 18618754.

45781681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 42837025 + 2944656 = 6545^2 + 1716^2 .

It is not a de Polignac number, because 45781681 - 2⁵ = 45781649 is a prime.

It is a super-2 number, since 2×45781681² = 4191924630371522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45781601) 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 in 5 ways as a sum of consecutive naturals, for example, 189060 + ... + 189301.

Almost surely, 2^45781681 is an apocalyptic number.

It is an amenable number.

45781681 is a deficient number, since it is larger than the sum of its proper divisors (4540465).

45781681 is a wasteful number, since it uses less digits than its factorization.

45781681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378383 (or 378372 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The square root of 45781681 is about 6766.2161508483. The cubic root of 45781681 is about 357.7370420045.

The spelling of 45781681 in words is "forty-five million, seven hundred eighty-one thousand, six hundred eighty-one".