12817631 has 2 divisors, whose sum is σ = 12817632. Its totient is φ = 12817630.

The previous prime is 12817627. The next prime is 12817639. The reversal of 12817631 is 13671821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12817631 - 2² = 12817627 is a prime.

It is a super-2 number, since 2×12817631² = 328583328904322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12817594 and 12817603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12817639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6408815 + 6408816.

It is an arithmetic number, because the mean of its divisors is an integer number (6408816).

Almost surely, 2^12817631 is an apocalyptic number.

12817631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12817631 is an equidigital number, since it uses as much as digits as its factorization.

12817631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 12817631 is about 3580.1719232461. The cubic root of 12817631 is about 234.0287726083.

The spelling of 12817631 in words is "twelve million, eight hundred seventeen thousand, six hundred thirty-one".