1255523985 has 24 divisors (see below), whose sum is σ = 2202467904. Its totient is φ = 661543200.

The previous prime is 1255523981. The next prime is 1255523989. The reversal of 1255523985 is 5893255521.

It is a happy number.

1255523985 is a `hidden beast` number, since 1 + 2 + 5 + 552 + 3 + 98 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1255523981) and next prime (1255523989).

It is not a de Polignac number, because 1255523985 - 2² = 1255523981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1255523985.

It is not an unprimeable number, because it can be changed into a prime (1255523981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164341 + ... + 171810.

It is an arithmetic number, because the mean of its divisors is an integer number (91769496).

Almost surely, 2^1255523985 is an apocalyptic number.

1255523985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1255523985 is a deficient number, since it is larger than the sum of its proper divisors (946943919).

1255523985 is a wasteful number, since it uses less digits than its factorization.

1255523985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336245 (or 336242 counting only the distinct ones).

The product of its digits is 540000, while the sum is 45.

The square root of 1255523985 is about 35433.3738867752. The cubic root of 1255523985 is about 1078.8018219241.

The spelling of 1255523985 in words is "one billion, two hundred fifty-five million, five hundred twenty-three thousand, nine hundred eighty-five".