36839981 has 2 divisors, whose sum is σ = 36839982. Its totient is φ = 36839980.

The previous prime is 36839977. The next prime is 36839987. The reversal of 36839981 is 18993863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32959081 + 3880900 = 5741^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 36839981 - 2² = 36839977 is a prime.

It is a super-3 number, since 3×36839981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36839987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18419990 + 18419991.

It is an arithmetic number, because the mean of its divisors is an integer number (18419991).

Almost surely, 2^36839981 is an apocalyptic number.

It is an amenable number.

36839981 is a deficient number, since it is larger than the sum of its proper divisors (1).

36839981 is an equidigital number, since it uses as much as digits as its factorization.

36839981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 36839981 is about 6069.5947970190. The cubic root of 36839981 is about 332.7411136730.

The spelling of 36839981 in words is "thirty-six million, eight hundred thirty-nine thousand, nine hundred eighty-one".