12721523 has 2 divisors, whose sum is σ = 12721524. Its totient is φ = 12721522.

The previous prime is 12721519. The next prime is 12721529. The reversal of 12721523 is 32512721.

It is a happy number.

12721523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12721523 - 2² = 12721519 is a prime.

It is equal to p₈₃₂₂₆₂ and since 12721523 and 832262 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12721529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360761 + 6360762.

It is an arithmetic number, because the mean of its divisors is an integer number (6360762).

Almost surely, 2^12721523 is an apocalyptic number.

12721523 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721523 is an equidigital number, since it uses as much as digits as its factorization.

12721523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 12721523 is about 3566.7244076323. The cubic root of 12721523 is about 233.4423800956.

The spelling of 12721523 in words is "twelve million, seven hundred twenty-one thousand, five hundred twenty-three".