40636561 has 8 divisors (see below), whose sum is σ = 48461184. Its totient is φ = 33316800.

The previous prime is 40636559. The next prime is 40636597. The reversal of 40636561 is 16563604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40636561 - 2¹ = 40636559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40636061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126040 + ... + 126361.

It is an arithmetic number, because the mean of its divisors is an integer number (6057648).

Almost surely, 2^40636561 is an apocalyptic number.

It is an amenable number.

40636561 is a deficient number, since it is larger than the sum of its proper divisors (7824623).

40636561 is a wasteful number, since it uses less digits than its factorization.

40636561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252431.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 40636561 is about 6374.6812469331. The cubic root of 40636561 is about 343.7998232576.

The spelling of 40636561 in words is "forty million, six hundred thirty-six thousand, five hundred sixty-one".