12491969 has 4 divisors (see below), whose sum is σ = 14276544. Its totient is φ = 10707396.

The previous prime is 12491939. The next prime is 12491971. The reversal of 12491969 is 96919421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-12491969 is a prime.

It is a super-2 number, since 2×12491969² = 312098578993922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12491909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892277 + ... + 892290.

It is an arithmetic number, because the mean of its divisors is an integer number (3569136).

Almost surely, 2^12491969 is an apocalyptic number.

It is an amenable number.

12491969 is a deficient number, since it is larger than the sum of its proper divisors (1784575).

12491969 is an equidigital number, since it uses as much as digits as its factorization.

12491969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784574.

The product of its digits is 34992, while the sum is 41.

The square root of 12491969 is about 3534.3979685372. The cubic root of 12491969 is about 232.0297288994.

The spelling of 12491969 in words is "twelve million, four hundred ninety-one thousand, nine hundred sixty-nine".