820272631 has 2 divisors, whose sum is σ = 820272632. Its totient is φ = 820272630.

The previous prime is 820272589. The next prime is 820272637. The reversal of 820272631 is 136272028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820272631 - 2¹³ = 820264439 is a prime.

It is a super-2 number, since 2×820272631² = 1345694378335324322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 820272593 and 820272602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820272637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410136315 + 410136316.

It is an arithmetic number, because the mean of its divisors is an integer number (410136316).

Almost surely, 2^820272631 is an apocalyptic number.

820272631 is a deficient number, since it is larger than the sum of its proper divisors (1).

820272631 is an equidigital number, since it uses as much as digits as its factorization.

820272631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 820272631 is about 28640.4020746916. The cubic root of 820272631 is about 936.0938825006.

The spelling of 820272631 in words is "eight hundred twenty million, two hundred seventy-two thousand, six hundred thirty-one".