45021681 has 12 divisors (see below), whose sum is σ = 65136708. Its totient is φ = 29965824.

The previous prime is 45021673. The next prime is 45021701. The reversal of 45021681 is 18612054.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 37271025 = 2784^2 + 6105^2 .

It is not a de Polignac number, because 45021681 - 2³ = 45021673 is a prime.

It is a super-2 number, since 2×45021681² = 4053903520131522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (45021181) 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 in 11 ways as a sum of consecutive naturals, for example, 2341 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (5428059).

Almost surely, 2^45021681 is an apocalyptic number.

It is an amenable number.

45021681 is a deficient number, since it is larger than the sum of its proper divisors (20115027).

45021681 is a wasteful number, since it uses less digits than its factorization.

45021681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8112 (or 8109 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 45021681 is about 6709.8197442256. The cubic root of 45021681 is about 355.7464449839.

The spelling of 45021681 in words is "forty-five million, twenty-one thousand, six hundred eighty-one".