40616561 has 4 divisors (see below), whose sum is σ = 40989300. Its totient is φ = 40243824.

The previous prime is 40616557. The next prime is 40616567. The reversal of 40616561 is 16561604.

40616561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36372961 + 4243600 = 6031^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 40616561 - 2² = 40616557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40616567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186206 + ... + 186423.

It is an arithmetic number, because the mean of its divisors is an integer number (10247325).

Almost surely, 2^40616561 is an apocalyptic number.

It is an amenable number.

40616561 is a deficient number, since it is larger than the sum of its proper divisors (372739).

40616561 is a wasteful number, since it uses less digits than its factorization.

40616561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372738.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40616561 is about 6373.1123479819. The cubic root of 40616561 is about 343.7434116203.

The spelling of 40616561 in words is "forty million, six hundred sixteen thousand, five hundred sixty-one".