12820631 has 2 divisors, whose sum is σ = 12820632. Its totient is φ = 12820630.

The previous prime is 12820603. The next prime is 12820657. The reversal of 12820631 is 13602821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12820631 - 2¹⁰ = 12819607 is a prime.

It is a super-2 number, since 2×12820631² = 328737158476322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12820597 and 12820606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12820681) 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, 6410315 + 6410316.

It is an arithmetic number, because the mean of its divisors is an integer number (6410316).

Almost surely, 2^12820631 is an apocalyptic number.

12820631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820631 is an equidigital number, since it uses as much as digits as its factorization.

12820631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 12820631 is about 3580.5908730264. The cubic root of 12820631 is about 234.0470295324.

The spelling of 12820631 in words is "twelve million, eight hundred twenty thousand, six hundred thirty-one".