1243157 has 2 divisors, whose sum is σ = 1243158. Its totient is φ = 1243156.

The previous prime is 1243147. The next prime is 1243169. The reversal of 1243157 is 7513421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 8836 = 1111^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243157 - 2⁴ = 1243141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621578 + 621579.

It is an arithmetic number, because the mean of its divisors is an integer number (621579).

2^1243157 is an apocalyptic number.

It is an amenable number.

1243157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243157 is an equidigital number, since it uses as much as digits as its factorization.

1243157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 1243157 is about 1114.9695063095. The cubic root of 1243157 is about 107.5248040835.

Adding to 1243157 its reverse (7513421), we get a palindrome (8756578).

The spelling of 1243157 in words is "one million, two hundred forty-three thousand, one hundred fifty-seven".