12861761 has 16 divisors (see below), whose sum is σ = 15154560. Its totient is φ = 10792320.

The previous prime is 12861743. The next prime is 12861767. The reversal of 12861761 is 16716821.

It is a happy number.

It is not a de Polignac number, because 12861761 - 2²² = 8667457 is a prime.

It is a super-2 number, since 2×12861761² = 330849792042242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12861767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6461 + ... + 8213.

It is an arithmetic number, because the mean of its divisors is an integer number (947160).

Almost surely, 2^12861761 is an apocalyptic number.

12861761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12861761 is a deficient number, since it is larger than the sum of its proper divisors (2292799).

12861761 is a wasteful number, since it uses less digits than its factorization.

12861761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816.

The product of its digits is 4032, while the sum is 32.

The square root of 12861761 is about 3586.3297394411. The cubic root of 12861761 is about 234.2970452687.

The spelling of 12861761 in words is "twelve million, eight hundred sixty-one thousand, seven hundred sixty-one".