36505981 has 8 divisors (see below), whose sum is σ = 37649664. Its totient is φ = 35377680.

The previous prime is 36505967. The next prime is 36506017. The reversal of 36505981 is 18950563.

36505981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 36505981 - 2¹⁷ = 36374909 is a prime.

It is a super-2 number, since 2×36505981² = 2665373297544722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36505981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36505921) 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 7 ways as a sum of consecutive naturals, for example, 1071 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (4706208).

Almost surely, 2^36505981 is an apocalyptic number.

It is an amenable number.

36505981 is a deficient number, since it is larger than the sum of its proper divisors (1143683).

36505981 is a wasteful number, since it uses less digits than its factorization.

36505981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7691.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 36505981 is about 6042.0179576032. The cubic root of 36505981 is about 331.7324894260.

The spelling of 36505981 in words is "thirty-six million, five hundred five thousand, nine hundred eighty-one".