12722991 has 8 divisors (see below), whose sum is σ = 16980480. Its totient is φ = 8473752.

The previous prime is 12722981. The next prime is 12722993. The reversal of 12722991 is 19922721.

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

It is not a de Polignac number, because 12722991 - 2⁵ = 12722959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12722993) 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, 4866 + ... + 7008.

It is an arithmetic number, because the mean of its divisors is an integer number (2122560).

Almost surely, 2^12722991 is an apocalyptic number.

12722991 is a deficient number, since it is larger than the sum of its proper divisors (4257489).

12722991 is a wasteful number, since it uses less digits than its factorization.

12722991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4125.

The product of its digits is 4536, while the sum is 33.

The square root of 12722991 is about 3566.9301927568. The cubic root of 12722991 is about 233.4513591104.

It can be divided in two parts, 12 and 722991, that added together give a triangular number (723003 = T₁₂₀₂).

The spelling of 12722991 in words is "twelve million, seven hundred twenty-two thousand, nine hundred ninety-one".