1255559491 has 2 divisors, whose sum is σ = 1255559492. Its totient is φ = 1255559490.

The previous prime is 1255559483. The next prime is 1255559549. The reversal of 1255559491 is 1949555521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255559491 - 2³ = 1255559483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255554491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627779745 + 627779746.

It is an arithmetic number, because the mean of its divisors is an integer number (627779746).

Almost surely, 2^1255559491 is an apocalyptic number.

1255559491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255559491 is an equidigital number, since it uses as much as digits as its factorization.

1255559491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 405000, while the sum is 46.

The square root of 1255559491 is about 35433.8749080594. The cubic root of 1255559491 is about 1078.8119912708.

The spelling of 1255559491 in words is "one billion, two hundred fifty-five million, five hundred fifty-nine thousand, four hundred ninety-one".