12571681 has 2 divisors, whose sum is σ = 12571682. Its totient is φ = 12571680.

The previous prime is 12571667. The next prime is 12571693. The reversal of 12571681 is 18617521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10923025 + 1648656 = 3305^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 12571681 - 2⁵ = 12571649 is a prime.

It is a super-2 number, since 2×12571681² = 316094326331522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12571621) 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, 6285840 + 6285841.

It is an arithmetic number, because the mean of its divisors is an integer number (6285841).

Almost surely, 2^12571681 is an apocalyptic number.

It is an amenable number.

12571681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12571681 is an equidigital number, since it uses as much as digits as its factorization.

12571681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 12571681 is about 3545.6566387624. The cubic root of 12571681 is about 232.5222147040.

The spelling of 12571681 in words is "twelve million, five hundred seventy-one thousand, six hundred eighty-one".