1255123399 has 2 divisors, whose sum is σ = 1255123400. Its totient is φ = 1255123398.

The previous prime is 1255123367. The next prime is 1255123423. The reversal of 1255123399 is 9933215521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1255123399 - 2⁵ = 1255123367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255123349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627561699 + 627561700.

It is an arithmetic number, because the mean of its divisors is an integer number (627561700).

Almost surely, 2^1255123399 is an apocalyptic number.

1255123399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255123399 is an equidigital number, since it uses as much as digits as its factorization.

1255123399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 40.

The square root of 1255123399 is about 35427.7207706056. The cubic root of 1255123399 is about 1078.6870759745.

The spelling of 1255123399 in words is "one billion, two hundred fifty-five million, one hundred twenty-three thousand, three hundred ninety-nine".