12749522 has 4 divisors (see below), whose sum is σ = 19124286. Its totient is φ = 6374760.

The previous prime is 12749509. The next prime is 12749537. The reversal of 12749522 is 22594721.

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

It can be written as a sum of positive squares in only one way, i.e., 10374841 + 2374681 = 3221^2 + 1541^2 .

It is a super-2 number, since 2×12749522² = 325100622456968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3187379 + ... + 3187382.

Almost surely, 2^12749522 is an apocalyptic number.

12749522 is a deficient number, since it is larger than the sum of its proper divisors (6374764).

12749522 is an equidigital number, since it uses as much as digits as its factorization.

12749522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6374763.

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

The square root of 12749522 is about 3570.6472802561. The cubic root of 12749522 is about 233.6135169393.

The spelling of 12749522 in words is "twelve million, seven hundred forty-nine thousand, five hundred twenty-two".