36205781 has 2 divisors, whose sum is σ = 36205782. Its totient is φ = 36205780.

The previous prime is 36205777. The next prime is 36205783. The reversal of 36205781 is 18750263.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25908100 + 10297681 = 5090^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 36205781 - 2² = 36205777 is a prime.

It is a super-2 number, since 2×36205781² = 2621717155639922, which contains 22 as substring.

Together with 36205783, 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 (36205783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18102890 + 18102891.

It is an arithmetic number, because the mean of its divisors is an integer number (18102891).

Almost surely, 2^36205781 is an apocalyptic number.

It is an amenable number.

36205781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36205781 is an equidigital number, since it uses as much as digits as its factorization.

36205781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 36205781 is about 6017.1239807735. The cubic root of 36205781 is about 330.8206724184.

The spelling of 36205781 in words is "thirty-six million, two hundred five thousand, seven hundred eighty-one".