126155993 has 2 divisors, whose sum is σ = 126155994. Its totient is φ = 126155992.

The previous prime is 126155971. The next prime is 126155999. The reversal of 126155993 is 399551621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105842944 + 20313049 = 10288^2 + 4507^2 .

It is a cyclic number.

It is not a de Polignac number, because 126155993 - 2⁸ = 126155737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126155993.

It is not a weakly prime, because it can be changed into another prime (126155999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63077996 + 63077997.

It is an arithmetic number, because the mean of its divisors is an integer number (63077997).

Almost surely, 2^126155993 is an apocalyptic number.

It is an amenable number.

126155993 is a deficient number, since it is larger than the sum of its proper divisors (1).

126155993 is an equidigital number, since it uses as much as digits as its factorization.

126155993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 41.

The square root of 126155993 is about 11231.9184915134. The cubic root of 126155993 is about 501.5365969024.

The spelling of 126155993 in words is "one hundred twenty-six million, one hundred fifty-five thousand, nine hundred ninety-three".