126857891 has 2 divisors, whose sum is σ = 126857892. Its totient is φ = 126857890.

The previous prime is 126857873. The next prime is 126857897. The reversal of 126857891 is 198758621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126857891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126857897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63428945 + 63428946.

It is an arithmetic number, because the mean of its divisors is an integer number (63428946).

Almost surely, 2^126857891 is an apocalyptic number.

126857891 is a deficient number, since it is larger than the sum of its proper divisors (1).

126857891 is an equidigital number, since it uses as much as digits as its factorization.

126857891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 47.

The square root of 126857891 is about 11263.1208374944. The cubic root of 126857891 is about 502.4650154270.

The spelling of 126857891 in words is "one hundred twenty-six million, eight hundred fifty-seven thousand, eight hundred ninety-one".