12491871 has 16 divisors (see below), whose sum is σ = 19084800. Its totient is φ = 7119648.

The previous prime is 12491867. The next prime is 12491879. The reversal of 12491871 is 17819421.

It is not a de Polignac number, because 12491871 - 2² = 12491867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14470 + ... + 15308.

It is an arithmetic number, because the mean of its divisors is an integer number (1192800).

Almost surely, 2^12491871 is an apocalyptic number.

12491871 is a deficient number, since it is larger than the sum of its proper divisors (6592929).

12491871 is an equidigital number, since it uses as much as digits as its factorization.

12491871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558.

The product of its digits is 4032, while the sum is 33.

The square root of 12491871 is about 3534.3841047628. The cubic root of 12491871 is about 232.0291221370.

The spelling of 12491871 in words is "twelve million, four hundred ninety-one thousand, eight hundred seventy-one".