36565681 has 4 divisors (see below), whose sum is σ = 36577792. Its totient is φ = 36553572.

The previous prime is 36565673. The next prime is 36565693. The reversal of 36565681 is 18656563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18656563 = 2441 ⋅7643.

It is a cyclic number.

It is not a de Polignac number, because 36565681 - 2³ = 36565673 is a prime.

It is a super-2 number, since 2×36565681² = 2674098053987522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36565621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2560 + ... + 8926.

It is an arithmetic number, because the mean of its divisors is an integer number (9144448).

Almost surely, 2^36565681 is an apocalyptic number.

It is an amenable number.

36565681 is a deficient number, since it is larger than the sum of its proper divisors (12111).

36565681 is an equidigital number, since it uses as much as digits as its factorization.

36565681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12110.

The product of its digits is 129600, while the sum is 40.

The square root of 36565681 is about 6046.9563418302. The cubic root of 36565681 is about 331.9132236798.

The spelling of 36565681 in words is "thirty-six million, five hundred sixty-five thousand, six hundred eighty-one".