1256259811 has 2 divisors, whose sum is σ = 1256259812. Its totient is φ = 1256259810.

The previous prime is 1256259799. The next prime is 1256259821. The reversal of 1256259811 is 1189526521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256259811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256259821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628129905 + 628129906.

It is an arithmetic number, because the mean of its divisors is an integer number (628129906).

Almost surely, 2^1256259811 is an apocalyptic number.

1256259811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256259811 is an equidigital number, since it uses as much as digits as its factorization.

1256259811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 40.

The square root of 1256259811 is about 35443.7555995411. The cubic root of 1256259811 is about 1079.0125321967.

The spelling of 1256259811 in words is "one billion, two hundred fifty-six million, two hundred fifty-nine thousand, eight hundred eleven".