12681157 has 4 divisors (see below), whose sum is σ = 12870496. Its totient is φ = 12491820.

The previous prime is 12681127. The next prime is 12681187. The reversal of 12681157 is 75118621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12681127) and next prime (12681187).

It is a cyclic number.

It is not a de Polignac number, because 12681157 - 2²³ = 4292549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94569 + ... + 94702.

It is an arithmetic number, because the mean of its divisors is an integer number (3217624).

Almost surely, 2^12681157 is an apocalyptic number.

It is an amenable number.

12681157 is a deficient number, since it is larger than the sum of its proper divisors (189339).

12681157 is an equidigital number, since it uses as much as digits as its factorization.

12681157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189338.

The product of its digits is 3360, while the sum is 31.

The square root of 12681157 is about 3561.0612182326. The cubic root of 12681157 is about 233.1952105439.

Adding to 12681157 its reverse (75118621), we get a palindrome (87799778).

It can be divided in two parts, 126811 and 57, that multiplied together give a palindrome (7228227).

The spelling of 12681157 in words is "twelve million, six hundred eighty-one thousand, one hundred fifty-seven".