1331255105 has 4 divisors (see below), whose sum is σ = 1597506132. Its totient is φ = 1065004080.

The previous prime is 1331255099. The next prime is 1331255137. The reversal of 1331255105 is 5015521331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5015521331 = 16007 ⋅313333.

It can be written as a sum of positive squares in 2 ways, for example, as 332442289 + 998812816 = 18233^2 + 31604^2 .

It is not a de Polignac number, because 1331255105 - 2²⁰ = 1330206529 is a prime.

It is a super-2 number, since 2×1331255105² = 3544480309177122050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133125506 + ... + 133125515.

It is an arithmetic number, because the mean of its divisors is an integer number (399376533).

Almost surely, 2^1331255105 is an apocalyptic number.

It is an amenable number.

1331255105 is a deficient number, since it is larger than the sum of its proper divisors (266251027).

1331255105 is an equidigital number, since it uses as much as digits as its factorization.

1331255105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266251026.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 1331255105 is about 36486.3687560163. The cubic root of 1331255105 is about 1100.0702723701.

Adding to 1331255105 its reverse (5015521331), we get a palindrome (6346776436).

The spelling of 1331255105 in words is "one billion, three hundred thirty-one million, two hundred fifty-five thousand, one hundred five".