12645761 has 4 divisors (see below), whose sum is σ = 12653652. Its totient is φ = 12637872.

The previous prime is 12645757. The next prime is 12645821. The reversal of 12645761 is 16754621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16754621 = 13 ⋅1288817.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 2660161 = 3160^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 12645761 - 2² = 12645757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12645751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (3163413).

Almost surely, 2^12645761 is an apocalyptic number.

It is an amenable number.

12645761 is a deficient number, since it is larger than the sum of its proper divisors (7891).

12645761 is an equidigital number, since it uses as much as digits as its factorization.

12645761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7890.

The product of its digits is 10080, while the sum is 32.

The square root of 12645761 is about 3556.0878785542. The cubic root of 12645761 is about 232.9780413648.

The spelling of 12645761 in words is "twelve million, six hundred forty-five thousand, seven hundred sixty-one".