36634781 has 2 divisors, whose sum is σ = 36634782. Its totient is φ = 36634780.

The previous prime is 36634769. The next prime is 36634783. The reversal of 36634781 is 18743663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36409156 + 225625 = 6034^2 + 475^2 .

It is an emirp because it is prime and its reverse (18743663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36634781 - 2¹⁴ = 36618397 is a prime.

It is a super-2 number, since 2×36634781² = 2684214357835922, which contains 22 as substring.

Together with 36634783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36634783) 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, 18317390 + 18317391.

It is an arithmetic number, because the mean of its divisors is an integer number (18317391).

Almost surely, 2^36634781 is an apocalyptic number.

It is an amenable number.

36634781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36634781 is an equidigital number, since it uses as much as digits as its factorization.

36634781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 36634781 is about 6052.6672632815. The cubic root of 36634781 is about 332.1221698009.

The spelling of 36634781 in words is "thirty-six million, six hundred thirty-four thousand, seven hundred eighty-one".