836047921 has 2 divisors, whose sum is σ = 836047922. Its totient is φ = 836047920.

The previous prime is 836047889. The next prime is 836047963. The reversal of 836047921 is 129740638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 793210896 + 42837025 = 28164^2 + 6545^2 .

It is a cyclic number.

It is not a de Polignac number, because 836047921 - 2⁵ = 836047889 is a prime.

It is a super-2 number, since 2×836047921² = 1397952252416844482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (836047321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 418023960 + 418023961.

It is an arithmetic number, because the mean of its divisors is an integer number (418023961).

Almost surely, 2^836047921 is an apocalyptic number.

It is an amenable number.

836047921 is a deficient number, since it is larger than the sum of its proper divisors (1).

836047921 is an equidigital number, since it uses as much as digits as its factorization.

836047921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 836047921 is about 28914.4932689473. The cubic root of 836047921 is about 942.0567312867.

The spelling of 836047921 in words is "eight hundred thirty-six million, forty-seven thousand, nine hundred twenty-one".