36690781 has 2 divisors, whose sum is σ = 36690782. Its totient is φ = 36690780.

The previous prime is 36690779. The next prime is 36690809. The reversal of 36690781 is 18709663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22174681 + 14516100 = 4709^2 + 3810^2 .

It is a cyclic number.

It is not a de Polignac number, because 36690781 - 2¹ = 36690779 is a prime.

It is a super-2 number, since 2×36690781² = 2692426820779922, which contains 22 as substring.

Together with 36690779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36690721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18345390 + 18345391.

It is an arithmetic number, because the mean of its divisors is an integer number (18345391).

Almost surely, 2^36690781 is an apocalyptic number.

It is an amenable number.

36690781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36690781 is an equidigital number, since it uses as much as digits as its factorization.

36690781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 36690781 is about 6057.2915564632. The cubic root of 36690781 is about 332.2913111861.

The spelling of 36690781 in words is "thirty-six million, six hundred ninety thousand, seven hundred eighty-one".