36781812917 has 2 divisors, whose sum is σ = 36781812918. Its totient is φ = 36781812916.

The previous prime is 36781812877. The next prime is 36781812931. The reversal of 36781812917 is 71921818763.

36781812917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34422865156 + 2358947761 = 185534^2 + 48569^2 .

It is an emirp because it is prime and its reverse (71921818763) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36781812917 - 2²⁶ = 36714704053 is a prime.

It is a super-2 number, since 2×36781812917² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36781812997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18390906458 + 18390906459.

It is an arithmetic number, because the mean of its divisors is an integer number (18390906459).

Almost surely, 2^36781812917 is an apocalyptic number.

It is an amenable number.

36781812917 is a deficient number, since it is larger than the sum of its proper divisors (1).

36781812917 is an equidigital number, since it uses as much as digits as its factorization.

36781812917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The spelling of 36781812917 in words is "thirty-six billion, seven hundred eighty-one million, eight hundred twelve thousand, nine hundred seventeen".