12491811 has 24 divisors (see below), whose sum is σ = 18566496. Its totient is φ = 8090880.

The previous prime is 12491807. The next prime is 12491819. The reversal of 12491811 is 11819421.

It is not a de Polignac number, because 12491811 - 2² = 12491807 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12491819) 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 23 ways as a sum of consecutive naturals, for example, 72121 + ... + 72293.

It is an arithmetic number, because the mean of its divisors is an integer number (773604).

Almost surely, 2^12491811 is an apocalyptic number.

12491811 is a deficient number, since it is larger than the sum of its proper divisors (6074685).

12491811 is a wasteful number, since it uses less digits than its factorization.

12491811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 360 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 12491811 is about 3534.3756167108. The cubic root of 12491811 is about 232.0287506482.

The spelling of 12491811 in words is "twelve million, four hundred ninety-one thousand, eight hundred eleven".