12520997 has 2 divisors, whose sum is σ = 12520998. Its totient is φ = 12520996.

The previous prime is 12520987. The next prime is 12520999. The reversal of 12520997 is 79902521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9541921 + 2979076 = 3089^2 + 1726^2 .

It is a cyclic number.

It is not a de Polignac number, because 12520997 - 2²⁰ = 11472421 is a prime.

Together with 12520999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12520999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260498 + 6260499.

It is an arithmetic number, because the mean of its divisors is an integer number (6260499).

Almost surely, 2^12520997 is an apocalyptic number.

It is an amenable number.

12520997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12520997 is an equidigital number, since it uses as much as digits as its factorization.

12520997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 12520997 is about 3538.5020842159. The cubic root of 12520997 is about 232.2093149101.

The spelling of 12520997 in words is "twelve million, five hundred twenty thousand, nine hundred ninety-seven".