36041981 has 2 divisors, whose sum is σ = 36041982. Its totient is φ = 36041980.

The previous prime is 36041963. The next prime is 36042001. The reversal of 36041981 is 18914063.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34456900 + 1585081 = 5870^2 + 1259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36041981 is a prime.

It is a super-2 number, since 2×36041981² = 2598048788808722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36041381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18020990 + 18020991.

It is an arithmetic number, because the mean of its divisors is an integer number (18020991).

Almost surely, 2^36041981 is an apocalyptic number.

It is an amenable number.

36041981 is a deficient number, since it is larger than the sum of its proper divisors (1).

36041981 is an equidigital number, since it uses as much as digits as its factorization.

36041981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 36041981 is about 6003.4973973510. The cubic root of 36041981 is about 330.3210252228.

The spelling of 36041981 in words is "thirty-six million, forty-one thousand, nine hundred eighty-one".