12491959 has 4 divisors (see below), whose sum is σ = 12502080. Its totient is φ = 12481840.

The previous prime is 12491939. The next prime is 12491971. The reversal of 12491959 is 95919421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12491959 - 2¹⁹ = 11967671 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491909) 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, 2902 + ... + 5779.

It is an arithmetic number, because the mean of its divisors is an integer number (3125520).

Almost surely, 2^12491959 is an apocalyptic number.

12491959 is a deficient number, since it is larger than the sum of its proper divisors (10121).

12491959 is an equidigital number, since it uses as much as digits as its factorization.

12491959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120.

The product of its digits is 29160, while the sum is 40.

The square root of 12491959 is about 3534.3965538688. The cubic root of 12491959 is about 232.0296669850.

The spelling of 12491959 in words is "twelve million, four hundred ninety-one thousand, nine hundred fifty-nine".