36656821 has 2 divisors, whose sum is σ = 36656822. Its totient is φ = 36656820.

The previous prime is 36656771. The next prime is 36656827. The reversal of 36656821 is 12865663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 2842596 = 5815^2 + 1686^2 .

It is an emirp because it is prime and its reverse (12865663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36656821 - 2⁷ = 36656693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36656827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18328410 + 18328411.

It is an arithmetic number, because the mean of its divisors is an integer number (18328411).

Almost surely, 2^36656821 is an apocalyptic number.

It is an amenable number.

36656821 is a deficient number, since it is larger than the sum of its proper divisors (1).

36656821 is an equidigital number, since it uses as much as digits as its factorization.

36656821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 36656821 is about 6054.4876744445. The cubic root of 36656821 is about 332.1887595733.

The spelling of 36656821 in words is "thirty-six million, six hundred fifty-six thousand, eight hundred twenty-one".