36447821 has 2 divisors, whose sum is σ = 36447822. Its totient is φ = 36447820.

The previous prime is 36447797. The next prime is 36447841. The reversal of 36447821 is 12874463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34456900 + 1990921 = 5870^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 36447821 - 2¹⁰ = 36446797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36447841) 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, 18223910 + 18223911.

It is an arithmetic number, because the mean of its divisors is an integer number (18223911).

Almost surely, 2^36447821 is an apocalyptic number.

It is an amenable number.

36447821 is a deficient number, since it is larger than the sum of its proper divisors (1).

36447821 is an equidigital number, since it uses as much as digits as its factorization.

36447821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 36447821 is about 6037.2030775849. The cubic root of 36447821 is about 331.5562277463.

The spelling of 36447821 in words is "thirty-six million, four hundred forty-seven thousand, eight hundred twenty-one".