12991282 has 4 divisors (see below), whose sum is σ = 19486926. Its totient is φ = 6495640.

The previous prime is 12991267. The next prime is 12991291. The reversal of 12991282 is 28219921.

12991282 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28219921 = 19 ⋅1485259.

It can be written as a sum of positive squares in only one way, i.e., 8874441 + 4116841 = 2979^2 + 2029^2 .

It is a super-3 number, since 3×12991282³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3247819 + ... + 3247822.

Almost surely, 2^12991282 is an apocalyptic number.

12991282 is a deficient number, since it is larger than the sum of its proper divisors (6495644).

12991282 is an equidigital number, since it uses as much as digits as its factorization.

12991282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495643.

The product of its digits is 5184, while the sum is 34.

The square root of 12991282 is about 3604.3421036300. The cubic root of 12991282 is about 235.0808956443.

The spelling of 12991282 in words is "twelve million, nine hundred ninety-one thousand, two hundred eighty-two".