12499951 has 4 divisors (see below), whose sum is σ = 12521152. Its totient is φ = 12478752.

The previous prime is 12499919. The next prime is 12499987. The reversal of 12499951 is 15999421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15999421 = 23 ⋅695627.

It is a cyclic number.

It is not a de Polignac number, because 12499951 - 2⁵ = 12499919 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 (12499901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9690 + ... + 10903.

It is an arithmetic number, because the mean of its divisors is an integer number (3130288).

Almost surely, 2^12499951 is an apocalyptic number.

12499951 is a deficient number, since it is larger than the sum of its proper divisors (21201).

12499951 is an equidigital number, since it uses as much as digits as its factorization.

12499951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21200.

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

The square root of 12499951 is about 3535.5269762795. The cubic root of 12499951 is about 232.0791384298.

The spelling of 12499951 in words is "twelve million, four hundred ninety-nine thousand, nine hundred fifty-one".