12247991 has 12 divisors (see below), whose sum is σ = 14581512. Its totient is φ = 10252368.

The previous prime is 12247981. The next prime is 12248011. The reversal of 12247991 is 19974221.

It is not a de Polignac number, because 12247991 - 2¹⁰ = 12246967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12247901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800 + ... + 5013.

It is an arithmetic number, because the mean of its divisors is an integer number (1215126).

Almost surely, 2^12247991 is an apocalyptic number.

12247991 is a deficient number, since it is larger than the sum of its proper divisors (2333521).

12247991 is an equidigital number, since it uses as much as digits as its factorization.

12247991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5870 (or 5863 counting only the distinct ones).

The product of its digits is 9072, while the sum is 35.

The square root of 12247991 is about 3499.7129882320. The cubic root of 12247991 is about 230.5092120548.

The spelling of 12247991 in words is "twelve million, two hundred forty-seven thousand, nine hundred ninety-one".