36781181 has 2 divisors, whose sum is σ = 36781182. Its totient is φ = 36781180.

The previous prime is 36781153. The next prime is 36781187. The reversal of 36781181 is 18118763.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29268100 + 7513081 = 5410^2 + 2741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36781181 is a prime.

It is a super-2 number, since 2×36781181² = 2705710551509522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36781187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18390590 + 18390591.

It is an arithmetic number, because the mean of its divisors is an integer number (18390591).

Almost surely, 2^36781181 is an apocalyptic number.

It is an amenable number.

36781181 is a deficient number, since it is larger than the sum of its proper divisors (1).

36781181 is an equidigital number, since it uses as much as digits as its factorization.

36781181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 36781181 is about 6064.7490467455. The cubic root of 36781181 is about 332.5639909251.

The spelling of 36781181 in words is "thirty-six million, seven hundred eighty-one thousand, one hundred eighty-one".