12990331 has 4 divisors (see below), whose sum is σ = 13555152. Its totient is φ = 12425512.

The previous prime is 12990323. The next prime is 12990361. The reversal of 12990331 is 13309921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13309921 = 673 ⋅19777.

It is a cyclic number.

It is not a de Polignac number, because 12990331 - 2³ = 12990323 is a prime.

It is a super-2 number, since 2×12990331² = 337497398979122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12990331.

It is not an unprimeable number, because it can be changed into a prime (12990311) 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, 282376 + ... + 282421.

It is an arithmetic number, because the mean of its divisors is an integer number (3388788).

Almost surely, 2^12990331 is an apocalyptic number.

12990331 is a deficient number, since it is larger than the sum of its proper divisors (564821).

12990331 is an equidigital number, since it uses as much as digits as its factorization.

12990331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564820.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 12990331 is about 3604.2101770013. The cubic root of 12990331 is about 235.0751593004.

The spelling of 12990331 in words is "twelve million, nine hundred ninety thousand, three hundred thirty-one".