12826991 has 4 divisors (see below), whose sum is σ = 12857184. Its totient is φ = 12796800.

The previous prime is 12826981. The next prime is 12826999. The reversal of 12826991 is 19962821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19962821 = 53 ⋅376657.

It is a cyclic number.

It is not a de Polignac number, because 12826991 - 2¹⁴ = 12810607 is a prime.

It is a super-2 number, since 2×12826991² = 329063396228162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12826999) 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, 14450 + ... + 15311.

It is an arithmetic number, because the mean of its divisors is an integer number (3214296).

Almost surely, 2^12826991 is an apocalyptic number.

12826991 is a deficient number, since it is larger than the sum of its proper divisors (30193).

12826991 is an equidigital number, since it uses as much as digits as its factorization.

12826991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30192.

The product of its digits is 15552, while the sum is 38.

The square root of 12826991 is about 3581.4788844833. The cubic root of 12826991 is about 234.0857247946.

The spelling of 12826991 in words is "twelve million, eight hundred twenty-six thousand, nine hundred ninety-one".