12691522 has 8 divisors (see below), whose sum is σ = 19165500. Its totient is φ = 6303024.

The previous prime is 12691519. The next prime is 12691529. The reversal of 12691522 is 22519621.

It can be written as a sum of positive squares in 2 ways, for example, as 10504081 + 2187441 = 3241^2 + 1479^2 .

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

It is a super-2 number, since 2×12691522² = 322149461352968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12691529) 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, 20997 + ... + 21592.

Almost surely, 2^12691522 is an apocalyptic number.

12691522 is a deficient number, since it is larger than the sum of its proper divisors (6473978).

12691522 is a wasteful number, since it uses less digits than its factorization.

12691522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42740.

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

The square root of 12691522 is about 3562.5162455770. The cubic root of 12691522 is about 233.2587276221.

The spelling of 12691522 in words is "twelve million, six hundred ninety-one thousand, five hundred twenty-two".