821272631 has 2 divisors, whose sum is σ = 821272632. Its totient is φ = 821272630.

The previous prime is 821272603. The next prime is 821272637. The reversal of 821272631 is 136272128.

821272631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821272631 is a prime.

It is a super-2 number, since 2×821272631² = 1348977468859324322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821272637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410636315 + 410636316.

It is an arithmetic number, because the mean of its divisors is an integer number (410636316).

Almost surely, 2^821272631 is an apocalyptic number.

821272631 is a deficient number, since it is larger than the sum of its proper divisors (1).

821272631 is an equidigital number, since it uses as much as digits as its factorization.

821272631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 821272631 is about 28657.8546126538. The cubic root of 821272631 is about 936.4741275171.

The spelling of 821272631 in words is "eight hundred twenty-one million, two hundred seventy-two thousand, six hundred thirty-one".