36111781 has 2 divisors, whose sum is σ = 36111782. Its totient is φ = 36111780.

The previous prime is 36111763. The next prime is 36111793. The reversal of 36111781 is 18711163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27730756 + 8381025 = 5266^2 + 2895^2 .

It is an emirp because it is prime and its reverse (18711163) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36111781 - 2¹⁵ = 36079013 is a prime.

It is a super-2 number, since 2×36111781² = 2608121453983922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36111721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18055890 + 18055891.

It is an arithmetic number, because the mean of its divisors is an integer number (18055891).

Almost surely, 2^36111781 is an apocalyptic number.

It is an amenable number.

36111781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36111781 is an equidigital number, since it uses as much as digits as its factorization.

36111781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 28.

The square root of 36111781 is about 6009.3078636395. The cubic root of 36111781 is about 330.5341243089.

The spelling of 36111781 in words is "thirty-six million, one hundred eleven thousand, seven hundred eighty-one".