40547681 has 2 divisors, whose sum is σ = 40547682. Its totient is φ = 40547680.

The previous prime is 40547657. The next prime is 40547693. The reversal of 40547681 is 18674504.

40547681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30250000 + 10297681 = 5500^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 40547681 - 2¹⁸ = 40285537 is a prime.

It is a super-2 number, since 2×40547681² = 3288228868955522, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (40547641) 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, 20273840 + 20273841.

It is an arithmetic number, because the mean of its divisors is an integer number (20273841).

Almost surely, 2^40547681 is an apocalyptic number.

It is an amenable number.

40547681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40547681 is an equidigital number, since it uses as much as digits as its factorization.

40547681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 40547681 is about 6367.7061018863. The cubic root of 40547681 is about 343.5489881097.

The spelling of 40547681 in words is "forty million, five hundred forty-seven thousand, six hundred eighty-one".