40501565 has 16 divisors (see below), whose sum is σ = 55420848. Its totient is φ = 28148736.

The previous prime is 40501541. The next prime is 40501577. The reversal of 40501565 is 56510504.

It can be written as a sum of positive squares in 8 ways, for example, as 1138489 + 39363076 = 1067^2 + 6274^2 .

It is not a de Polignac number, because 40501565 - 2¹⁶ = 40436029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17222 + ... + 19431.

It is an arithmetic number, because the mean of its divisors is an integer number (3463803).

Almost surely, 2^40501565 is an apocalyptic number.

It is an amenable number.

40501565 is a deficient number, since it is larger than the sum of its proper divisors (14919283).

40501565 is a wasteful number, since it uses less digits than its factorization.

40501565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36688.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 40501565 is about 6364.0839875036. The cubic root of 40501565 is about 343.4186961110.

The spelling of 40501565 in words is "forty million, five hundred one thousand, five hundred sixty-five".