13243157 has 2 divisors, whose sum is σ = 13243158. Its totient is φ = 13243156.

The previous prime is 13243141. The next prime is 13243159. The reversal of 13243157 is 75134231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9186961 + 4056196 = 3031^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 13243157 - 2⁴ = 13243141 is a prime.

Together with 13243159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13243159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6621578 + 6621579.

It is an arithmetic number, because the mean of its divisors is an integer number (6621579).

Almost surely, 2^13243157 is an apocalyptic number.

It is an amenable number.

13243157 is a deficient number, since it is larger than the sum of its proper divisors (1).

13243157 is an equidigital number, since it uses as much as digits as its factorization.

13243157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 13243157 is about 3639.1148649088. The cubic root of 13243157 is about 236.5904312634.

Adding to 13243157 its reverse (75134231), we get a palindrome (88377388).

The spelling of 13243157 in words is "thirteen million, two hundred forty-three thousand, one hundred fifty-seven".