40450561 has 2 divisors, whose sum is σ = 40450562. Its totient is φ = 40450560.

The previous prime is 40450549. The next prime is 40450591. The reversal of 40450561 is 16505404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40449600 + 961 = 6360^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 40450561 - 2⁷ = 40450433 is a prime.

It is not a weakly prime, because it can be changed into another prime (40450591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20225280 + 20225281.

It is an arithmetic number, because the mean of its divisors is an integer number (20225281).

Almost surely, 2^40450561 is an apocalyptic number.

It is an amenable number.

40450561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40450561 is an equidigital number, since it uses as much as digits as its factorization.

40450561 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 40450561 is about 6360.0755498657. The cubic root of 40450561 is about 343.2744787628.

Adding to 40450561 its reverse (16505404), we get a palindrome (56955965).

The spelling of 40450561 in words is "forty million, four hundred fifty thousand, five hundred sixty-one".