36870781 has 2 divisors, whose sum is σ = 36870782. Its totient is φ = 36870780.

The previous prime is 36870751. The next prime is 36870829. The reversal of 36870781 is 18707863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 1229881 = 5970^2 + 1109^2 .

It is an emirp because it is prime and its reverse (18707863) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36870781 - 2⁹ = 36870269 is a prime.

It is a super-2 number, since 2×36870781² = 2718908983099922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36870751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18435390 + 18435391.

It is an arithmetic number, because the mean of its divisors is an integer number (18435391).

Almost surely, 2^36870781 is an apocalyptic number.

It is an amenable number.

36870781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36870781 is an equidigital number, since it uses as much as digits as its factorization.

36870781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 36870781 is about 6072.1315038461. The cubic root of 36870781 is about 332.8338170466.

The spelling of 36870781 in words is "thirty-six million, eight hundred seventy thousand, seven hundred eighty-one".