12767561 has 8 divisors (see below), whose sum is σ = 13646880. Its totient is φ = 11902528.

The previous prime is 12767551. The next prime is 12767591. The reversal of 12767561 is 16576721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12767561 - 2¹⁸ = 12505417 is a prime.

It is a super-2 number, since 2×12767561² = 326021227777442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12767551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1691 + ... + 5328.

It is an arithmetic number, because the mean of its divisors is an integer number (1705860).

Almost surely, 2^12767561 is an apocalyptic number.

It is an amenable number.

12767561 is a deficient number, since it is larger than the sum of its proper divisors (879319).

12767561 is a wasteful number, since it uses less digits than its factorization.

12767561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7143.

The product of its digits is 17640, while the sum is 35.

The square root of 12767561 is about 3573.1723999830. The cubic root of 12767561 is about 233.7236431147.

The spelling of 12767561 in words is "twelve million, seven hundred sixty-seven thousand, five hundred sixty-one".