126155891 has 2 divisors, whose sum is σ = 126155892. Its totient is φ = 126155890.

The previous prime is 126155879. The next prime is 126155941. The reversal of 126155891 is 198551621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126155891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126155791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63077945 + 63077946.

It is an arithmetic number, because the mean of its divisors is an integer number (63077946).

Almost surely, 2^126155891 is an apocalyptic number.

126155891 is a deficient number, since it is larger than the sum of its proper divisors (1).

126155891 is an equidigital number, since it uses as much as digits as its factorization.

126155891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 38.

The square root of 126155891 is about 11231.9139508812. The cubic root of 126155891 is about 501.5364617345.

The spelling of 126155891 in words is "one hundred twenty-six million, one hundred fifty-five thousand, eight hundred ninety-one".