12547813 has 2 divisors, whose sum is σ = 12547814. Its totient is φ = 12547812.

The previous prime is 12547789. The next prime is 12547817. The reversal of 12547813 is 31874521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7086244 + 5461569 = 2662^2 + 2337^2 .

It is a cyclic number.

It is not a de Polignac number, because 12547813 - 2¹⁷ = 12416741 is a prime.

It is a super-2 number, since 2×12547813² = 314895222165938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12547817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6273906 + 6273907.

It is an arithmetic number, because the mean of its divisors is an integer number (6273907).

Almost surely, 2^12547813 is an apocalyptic number.

It is an amenable number.

12547813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12547813 is an equidigital number, since it uses as much as digits as its factorization.

12547813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 12547813 is about 3542.2892315563. The cubic root of 12547813 is about 232.3749695808.

It can be divided in two parts, 12 and 547813, that multiplied together give a palindrome (6573756).

The spelling of 12547813 in words is "twelve million, five hundred forty-seven thousand, eight hundred thirteen".