1255115521 has 8 divisors (see below), whose sum is σ = 1381335264. Its totient is φ = 1130915520.

The previous prime is 1255115513. The next prime is 1255115527.

1255115521 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1255115521 - 2³ = 1255115513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1255115521.

It is not an unprimeable number, because it can be changed into a prime (1255115527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503631 + ... + 506116.

It is an arithmetic number, because the mean of its divisors is an integer number (172666908).

Almost surely, 2^1255115521 is an apocalyptic number.

1255115521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1255115521 is a deficient number, since it is larger than the sum of its proper divisors (126219743).

1255115521 is a wasteful number, since it uses less digits than its factorization.

1255115521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009871.

The product of its digits is 2500, while the sum is 28.

The square root of 1255115521 is about 35427.6095863099. The cubic root of 1255115521 is about 1078.6848191142.

The spelling of 1255115521 in words is "one billion, two hundred fifty-five million, one hundred fifteen thousand, five hundred twenty-one".