36818981 has 2 divisors, whose sum is σ = 36818982. Its totient is φ = 36818980.

The previous prime is 36818963. The next prime is 36818983. The reversal of 36818981 is 18981863.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32878756 + 3940225 = 5734^2 + 1985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36818981 is a prime.

It is a super-2 number, since 2×36818981² = 2711274723756722, which contains 22 as substring.

Together with 36818983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36818983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18409490 + 18409491.

It is an arithmetic number, because the mean of its divisors is an integer number (18409491).

Almost surely, 2^36818981 is an apocalyptic number.

It is an amenable number.

36818981 is a deficient number, since it is larger than the sum of its proper divisors (1).

36818981 is an equidigital number, since it uses as much as digits as its factorization.

36818981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 44.

The square root of 36818981 is about 6067.8646161562. The cubic root of 36818981 is about 332.6778771988.

The spelling of 36818981 in words is "thirty-six million, eight hundred eighteen thousand, nine hundred eighty-one".