40054561 has 2 divisors, whose sum is σ = 40054562. Its totient is φ = 40054560.

The previous prime is 40054559. The next prime is 40054571. The reversal of 40054561 is 16545004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22043025 + 18011536 = 4695^2 + 4244^2 .

It is a cyclic number.

It is not a de Polignac number, because 40054561 - 2¹ = 40054559 is a prime.

Together with 40054559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40054571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20027280 + 20027281.

It is an arithmetic number, because the mean of its divisors is an integer number (20027281).

Almost surely, 2^40054561 is an apocalyptic number.

It is an amenable number.

40054561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40054561 is an equidigital number, since it uses as much as digits as its factorization.

40054561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 40054561 is about 6328.8672762193. The cubic root of 40054561 is about 342.1506153511.

Adding to 40054561 its reverse (16545004), we get a palindrome (56599565).

The spelling of 40054561 in words is "forty million, fifty-four thousand, five hundred sixty-one".