12720997 has 2 divisors, whose sum is σ = 12720998. Its totient is φ = 12720996.

The previous prime is 12720977. The next prime is 12721019. The reversal of 12720997 is 79902721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10962721 + 1758276 = 3311^2 + 1326^2 .

It is a cyclic number.

It is not a de Polignac number, because 12720997 - 2²³ = 4332389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12720977) 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, 6360498 + 6360499.

It is an arithmetic number, because the mean of its divisors is an integer number (6360499).

Almost surely, 2^12720997 is an apocalyptic number.

It is an amenable number.

12720997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12720997 is an equidigital number, since it uses as much as digits as its factorization.

12720997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 12720997 is about 3566.6506697461. The cubic root of 12720997 is about 233.4391626510.

The spelling of 12720997 in words is "twelve million, seven hundred twenty thousand, nine hundred ninety-seven".