36172781 has 2 divisors, whose sum is σ = 36172782. Its totient is φ = 36172780.

The previous prime is 36172739. The next prime is 36172793. The reversal of 36172781 is 18727163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35880100 + 292681 = 5990^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 36172781 - 2¹⁴ = 36156397 is a prime.

It is a super-2 number, since 2×36172781² = 2616940170547922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36172711) 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, 18086390 + 18086391.

It is an arithmetic number, because the mean of its divisors is an integer number (18086391).

Almost surely, 2^36172781 is an apocalyptic number.

It is an amenable number.

36172781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36172781 is an equidigital number, since it uses as much as digits as its factorization.

36172781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 36172781 is about 6014.3811818008. The cubic root of 36172781 is about 330.7201322985.

The spelling of 36172781 in words is "thirty-six million, one hundred seventy-two thousand, seven hundred eighty-one".