40812661 has 2 divisors, whose sum is σ = 40812662. Its totient is φ = 40812660.

The previous prime is 40812643. The next prime is 40812679. The reversal of 40812661 is 16621804.

40812661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (40812643) and next prime (40812679).

It can be written as a sum of positive squares in only one way, i.e., 34000561 + 6812100 = 5831^2 + 2610^2 .

It is a cyclic number.

It is not a de Polignac number, because 40812661 - 2²³ = 32424053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40812691) 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, 20406330 + 20406331.

It is an arithmetic number, because the mean of its divisors is an integer number (20406331).

Almost surely, 2^40812661 is an apocalyptic number.

It is an amenable number.

40812661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40812661 is an equidigital number, since it uses as much as digits as its factorization.

40812661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 40812661 is about 6388.4787704116. The cubic root of 40812661 is about 344.2957305721.

The spelling of 40812661 in words is "forty million, eight hundred twelve thousand, six hundred sixty-one".