40569761 has 2 divisors, whose sum is σ = 40569762. Its totient is φ = 40569760.

The previous prime is 40569713. The next prime is 40569817. The reversal of 40569761 is 16796504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39929761 + 640000 = 6319^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 40569761 - 2¹⁴ = 40553377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40569461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20284880 + 20284881.

It is an arithmetic number, because the mean of its divisors is an integer number (20284881).

Almost surely, 2^40569761 is an apocalyptic number.

40569761 is the 2849-th centered decagonal number.

It is an amenable number.

40569761 is a deficient number, since it is larger than the sum of its proper divisors (1).

40569761 is an equidigital number, since it uses as much as digits as its factorization.

40569761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 40569761 is about 6369.4396142832. The cubic root of 40569761 is about 343.6113359842.

The spelling of 40569761 in words is "forty million, five hundred sixty-nine thousand, seven hundred sixty-one".