36635821 has 2 divisors, whose sum is σ = 36635822. Its totient is φ = 36635820.

The previous prime is 36635779. The next prime is 36635861. The reversal of 36635821 is 12853663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33698025 + 2937796 = 5805^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 36635821 - 2²⁵ = 3081389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36635861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18317910 + 18317911.

It is an arithmetic number, because the mean of its divisors is an integer number (18317911).

Almost surely, 2^36635821 is an apocalyptic number.

It is an amenable number.

36635821 is a deficient number, since it is larger than the sum of its proper divisors (1).

36635821 is an equidigital number, since it uses as much as digits as its factorization.

36635821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 36635821 is about 6052.7531752088. The cubic root of 36635821 is about 332.1253125684.

The spelling of 36635821 in words is "thirty-six million, six hundred thirty-five thousand, eight hundred twenty-one".