1312555105 has 4 divisors (see below), whose sum is σ = 1575066132. Its totient is φ = 1050044080.

The previous prime is 1312555081. The next prime is 1312555121. The reversal of 1312555105 is 5015552131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 205262929 + 1107292176 = 14327^2 + 33276^2 .

It is not a de Polignac number, because 1312555105 - 2¹⁷ = 1312424033 is a prime.

It is a super-2 number, since 2×1312555105² = 3445601807323122050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131255506 + ... + 131255515.

It is an arithmetic number, because the mean of its divisors is an integer number (393766533).

Almost surely, 2^1312555105 is an apocalyptic number.

It is an amenable number.

1312555105 is a deficient number, since it is larger than the sum of its proper divisors (262511027).

1312555105 is an equidigital number, since it uses as much as digits as its factorization.

1312555105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262511026.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 1312555105 is about 36229.2023787441. The cubic root of 1312555105 is about 1094.8951075132.

The spelling of 1312555105 in words is "one billion, three hundred twelve million, five hundred fifty-five thousand, one hundred five".