1255981536 has 72 divisors (see below), whose sum is σ = 3658846464. Its totient is φ = 408445440.

The previous prime is 1255981513. The next prime is 1255981541. The reversal of 1255981536 is 6351895521.

1255981536 is a `hidden beast` number, since 1 + 2 + 5 + 598 + 1 + 53 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 1255981491 and 1255981500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41376 + ... + 64991.

It is an arithmetic number, because the mean of its divisors is an integer number (50817312).

Almost surely, 2^1255981536 is an apocalyptic number.

1255981536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1255981536 is an abundant number, since it is smaller than the sum of its proper divisors (2402864928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255981536 is a wasteful number, since it uses less digits than its factorization.

1255981536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106424 (or 106413 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 1255981536 is about 35439.8297964310. The cubic root of 1255981536 is about 1078.9328553700.

The spelling of 1255981536 in words is "one billion, two hundred fifty-five million, nine hundred eighty-one thousand, five hundred thirty-six".