40504561 has 24 divisors (see below), whose sum is σ = 45674280. Its totient is φ = 35852544.

The previous prime is 40504559. The next prime is 40504567. The reversal of 40504561 is 16540504.

It can be written as a sum of positive squares in 4 ways, for example, as 11182336 + 29322225 = 3344^2 + 5415^2 .

It is not a de Polignac number, because 40504561 - 2¹ = 40504559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40504567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 554821 + ... + 554893.

It is an arithmetic number, because the mean of its divisors is an integer number (1903095).

Almost surely, 2^40504561 is an apocalyptic number.

It is an amenable number.

40504561 is a deficient number, since it is larger than the sum of its proper divisors (5169719).

40504561 is a wasteful number, since it uses less digits than its factorization.

40504561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 174 counting only the distinct ones).

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

The square root of 40504561 is about 6364.3193665937. The cubic root of 40504561 is about 343.4271637430.

The spelling of 40504561 in words is "forty million, five hundred four thousand, five hundred sixty-one".