1256426611 has 12 divisors (see below), whose sum is σ = 1383865000. Its totient is φ = 1139862240.

The previous prime is 1256426609. The next prime is 1256426659. The reversal of 1256426611 is 1166246521.

It is not a de Polignac number, because 1256426611 - 2¹ = 1256426609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256420611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49975 + ... + 70783.

Almost surely, 2^1256426611 is an apocalyptic number.

1256426611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1256426611 is a deficient number, since it is larger than the sum of its proper divisors (127438389).

1256426611 is a wasteful number, since it uses less digits than its factorization.

1256426611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21330 (or 21319 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 1256426611 is about 35446.1085452268. The cubic root of 1256426611 is about 1079.0602854093.

The spelling of 1256426611 in words is "one billion, two hundred fifty-six million, four hundred twenty-six thousand, six hundred eleven".