12491071 has 2 divisors, whose sum is σ = 12491072. Its totient is φ = 12491070.

The previous prime is 12491069. The next prime is 12491131. The reversal of 12491071 is 17019421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12491071 - 2¹ = 12491069 is a prime.

Together with 12491069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12491771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6245535 + 6245536.

It is an arithmetic number, because the mean of its divisors is an integer number (6245536).

Almost surely, 2^12491071 is an apocalyptic number.

12491071 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491071 is an equidigital number, since it uses as much as digits as its factorization.

12491071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 12491071 is about 3534.2709290602. The cubic root of 12491071 is about 232.0241688555.

The spelling of 12491071 in words is "twelve million, four hundred ninety-one thousand, seventy-one".