12691045 has 8 divisors (see below), whose sum is σ = 15267960. Its totient is φ = 10127040.

The previous prime is 12691043. The next prime is 12691057. The reversal of 12691045 is 54019621.

It can be written as a sum of positive squares in 4 ways, for example, as 643204 + 12047841 = 802^2 + 3471^2 .

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

It is not a de Polignac number, because 12691045 - 2¹ = 12691043 is a prime.

It is a super-2 number, since 2×12691045² = 322125246384050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691043) 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 7 ways as a sum of consecutive naturals, for example, 910 + ... + 5119.

It is an arithmetic number, because the mean of its divisors is an integer number (1908495).

Almost surely, 2^12691045 is an apocalyptic number.

It is an amenable number.

12691045 is a deficient number, since it is larger than the sum of its proper divisors (2576915).

12691045 is an equidigital number, since it uses as much as digits as its factorization.

12691045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6455.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 12691045 is about 3562.4492978848. The cubic root of 12691045 is about 233.2558053089.

The spelling of 12691045 in words is "twelve million, six hundred ninety-one thousand, forty-five".