12705491 has 4 divisors (see below), whose sum is σ = 12866400. Its totient is φ = 12544584.

The previous prime is 12705481. The next prime is 12705493. The reversal of 12705491 is 19450721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12705491 - 2¹⁰ = 12704467 is a prime.

It is a super-2 number, since 2×12705491² = 322859003102162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12705493) 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, 80336 + ... + 80493.

It is an arithmetic number, because the mean of its divisors is an integer number (3216600).

Almost surely, 2^12705491 is an apocalyptic number.

12705491 is a deficient number, since it is larger than the sum of its proper divisors (160909).

12705491 is an equidigital number, since it uses as much as digits as its factorization.

12705491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160908.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 12705491 is about 3564.4762588633. The cubic root of 12705491 is about 233.3442754506.

The spelling of 12705491 in words is "twelve million, seven hundred five thousand, four hundred ninety-one".