836729221 has 2 divisors, whose sum is σ = 836729222. Its totient is φ = 836729220.

The previous prime is 836729207. The next prime is 836729251. The reversal of 836729221 is 122927638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 730350625 + 106378596 = 27025^2 + 10314^2 .

It is a cyclic number.

It is not a de Polignac number, because 836729221 - 2⁷ = 836729093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (836729251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 418364610 + 418364611.

It is an arithmetic number, because the mean of its divisors is an integer number (418364611).

Almost surely, 2^836729221 is an apocalyptic number.

It is an amenable number.

836729221 is a deficient number, since it is larger than the sum of its proper divisors (1).

836729221 is an equidigital number, since it uses as much as digits as its factorization.

836729221 is an evil number, because the sum of its binary digits is even.

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

The square root of 836729221 is about 28926.2721587141. The cubic root of 836729221 is about 942.3125575267.

The spelling of 836729221 in words is "eight hundred thirty-six million, seven hundred twenty-nine thousand, two hundred twenty-one".