36641681 has 4 divisors (see below), whose sum is σ = 38797092. Its totient is φ = 34486272.

The previous prime is 36641677. The next prime is 36641687. The reversal of 36641681 is 18614663.

36641681 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 31259281 + 5382400 = 5591^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 36641681 - 2² = 36641677 is a prime.

It is a super-2 number, since 2×36641681² = 2685225573011522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36641687) 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, 1077680 + ... + 1077713.

It is an arithmetic number, because the mean of its divisors is an integer number (9699273).

Almost surely, 2^36641681 is an apocalyptic number.

It is an amenable number.

36641681 is a deficient number, since it is larger than the sum of its proper divisors (2155411).

36641681 is a wasteful number, since it uses less digits than its factorization.

36641681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155410.

The product of its digits is 20736, while the sum is 35.

The square root of 36641681 is about 6053.2372330845. The cubic root of 36641681 is about 332.1430197424.

The spelling of 36641681 in words is "thirty-six million, six hundred forty-one thousand, six hundred eighty-one".