1255021559 has 12 divisors (see below), whose sum is σ = 1386445200. Its totient is φ = 1135173600.

The previous prime is 1255021451. The next prime is 1255021561. The reversal of 1255021559 is 9551205521.

It is a de Polignac number, because none of the positive numbers 2^k-1255021559 is a prime.

It is a super-2 number, since 2×1255021559² = 3150158227109580962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255026559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1982 + ... + 50139.

It is an arithmetic number, because the mean of its divisors is an integer number (115537100).

Almost surely, 2^1255021559 is an apocalyptic number.

1255021559 is a deficient number, since it is larger than the sum of its proper divisors (131423641).

1255021559 is a wasteful number, since it uses less digits than its factorization.

1255021559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52342 (or 52331 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 1255021559 is about 35426.2834488745. The cubic root of 1255021559 is about 1078.6579004998.

The spelling of 1255021559 in words is "one billion, two hundred fifty-five million, twenty-one thousand, five hundred fifty-nine".