12491143 has 8 divisors (see below), whose sum is σ = 14579712. Its totient is φ = 10478616.

The previous prime is 12491137. The next prime is 12491159. The reversal of 12491143 is 34119421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12491143 - 2²¹ = 10393991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18655 + ... + 19312.

It is an arithmetic number, because the mean of its divisors is an integer number (1822464).

Almost surely, 2^12491143 is an apocalyptic number.

12491143 is a deficient number, since it is larger than the sum of its proper divisors (2088569).

12491143 is an equidigital number, since it uses as much as digits as its factorization.

12491143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38021.

The product of its digits is 864, while the sum is 25.

The square root of 12491143 is about 3534.2811150218. The cubic root of 12491143 is about 232.0246146595.

The spelling of 12491143 in words is "twelve million, four hundred ninety-one thousand, one hundred forty-three".