45188681 has 2 divisors, whose sum is σ = 45188682. Its totient is φ = 45188680.

The previous prime is 45188677. The next prime is 45188723. The reversal of 45188681 is 18688154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44342281 + 846400 = 6659^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 45188681 - 2² = 45188677 is a prime.

It is a super-2 number, since 2×45188681² = 4084033781039522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (45188621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22594340 + 22594341.

It is an arithmetic number, because the mean of its divisors is an integer number (22594341).

Almost surely, 2^45188681 is an apocalyptic number.

It is an amenable number.

45188681 is a deficient number, since it is larger than the sum of its proper divisors (1).

45188681 is an equidigital number, since it uses as much as digits as its factorization.

45188681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61440, while the sum is 41.

The square root of 45188681 is about 6722.2526730256. The cubic root of 45188681 is about 356.1857618451.

The spelling of 45188681 in words is "forty-five million, one hundred eighty-eight thousand, six hundred eighty-one".