36686981 has 4 divisors (see below), whose sum is σ = 37870464. Its totient is φ = 35503500.

The previous prime is 36686977. The next prime is 36687019. The reversal of 36686981 is 18968663.

36686981 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 36686981 - 2² = 36686977 is a prime.

It is a super-2 number, since 2×36686981² = 2691869149788722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36686921) 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, 591695 + ... + 591756.

It is an arithmetic number, because the mean of its divisors is an integer number (9467616).

Almost surely, 2^36686981 is an apocalyptic number.

36686981 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

36686981 is a deficient number, since it is larger than the sum of its proper divisors (1183483).

36686981 is a wasteful number, since it uses less digits than its factorization.

36686981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183482.

The product of its digits is 373248, while the sum is 47.

The square root of 36686981 is about 6056.9778767963. The cubic root of 36686981 is about 332.2798391801.

The spelling of 36686981 in words is "thirty-six million, six hundred eighty-six thousand, nine hundred eighty-one".