1256225611 has 2 divisors, whose sum is σ = 1256225612. Its totient is φ = 1256225610.

The previous prime is 1256225513. The next prime is 1256225627. The reversal of 1256225611 is 1165226521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256225611 - 2⁷ = 1256225483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256225651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628112805 + 628112806.

It is an arithmetic number, because the mean of its divisors is an integer number (628112806).

Almost surely, 2^1256225611 is an apocalyptic number.

1256225611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256225611 is an equidigital number, since it uses as much as digits as its factorization.

1256225611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 1256225611 is about 35443.2731417402. The cubic root of 1256225611 is about 1079.0027405482.

The spelling of 1256225611 in words is "one billion, two hundred fifty-six million, two hundred twenty-five thousand, six hundred eleven".