12591857 has 2 divisors, whose sum is σ = 12591858. Its totient is φ = 12591856.

The previous prime is 12591827. The next prime is 12591893. The reversal of 12591857 is 75819521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6754801 + 5837056 = 2599^2 + 2416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12591857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12591857.

It is not a weakly prime, because it can be changed into another prime (12591827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6295928 + 6295929.

It is an arithmetic number, because the mean of its divisors is an integer number (6295929).

Almost surely, 2^12591857 is an apocalyptic number.

It is an amenable number.

12591857 is a deficient number, since it is larger than the sum of its proper divisors (1).

12591857 is an equidigital number, since it uses as much as digits as its factorization.

12591857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 38.

The square root of 12591857 is about 3548.5006692968. The cubic root of 12591857 is about 232.6465380608.

The spelling of 12591857 in words is "twelve million, five hundred ninety-one thousand, eight hundred fifty-seven".