1255621085 has 8 divisors (see below), whose sum is σ = 1547468376. Its totient is φ = 977348160.

The previous prime is 1255621069. The next prime is 1255621093. The reversal of 1255621085 is 5801265521.

It can be written as a sum of positive squares in 4 ways, for example, as 106275481 + 1149345604 = 10309^2 + 33902^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1255621085 - 2⁴ = 1255621069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3393386 + ... + 3393755.

It is an arithmetic number, because the mean of its divisors is an integer number (193433547).

Almost surely, 2^1255621085 is an apocalyptic number.

It is an amenable number.

1255621085 is a deficient number, since it is larger than the sum of its proper divisors (291847291).

1255621085 is an equidigital number, since it uses as much as digits as its factorization.

1255621085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6787183.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 1255621085 is about 35434.7440374557. The cubic root of 1255621085 is about 1078.8296320808.

The spelling of 1255621085 in words is "one billion, two hundred fifty-five million, six hundred twenty-one thousand, eighty-five".