12881761 has 4 divisors (see below), whose sum is σ = 12943024. Its totient is φ = 12820500.

The previous prime is 12881741. The next prime is 12881773. The reversal of 12881761 is 16718821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16718821 = 7 ⋅2388403.

It is a cyclic number.

It is not a de Polignac number, because 12881761 - 2¹⁹ = 12357473 is a prime.

It is a super-2 number, since 2×12881761² = 331879532922242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12881711) 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 in 3 ways as a sum of consecutive naturals, for example, 30315 + ... + 30736.

It is an arithmetic number, because the mean of its divisors is an integer number (3235756).

Almost surely, 2^12881761 is an apocalyptic number.

It is an amenable number.

12881761 is a deficient number, since it is larger than the sum of its proper divisors (61263).

12881761 is an equidigital number, since it uses as much as digits as its factorization.

12881761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61262.

The product of its digits is 5376, while the sum is 34.

The square root of 12881761 is about 3589.1170223329. The cubic root of 12881761 is about 234.4184261103.

The spelling of 12881761 in words is "twelve million, eight hundred eighty-one thousand, seven hundred sixty-one".