1311375055 has 4 divisors (see below), whose sum is σ = 1573650072. Its totient is φ = 1049100040.

The previous prime is 1311375049. The next prime is 1311375077. The reversal of 1311375055 is 5505731131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5505731131 = 24763 ⋅222337.

It is not a de Polignac number, because 1311375055 - 2¹⁹ = 1310850767 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent 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, 131137501 + ... + 131137510.

It is an arithmetic number, because the mean of its divisors is an integer number (393412518).

Almost surely, 2^1311375055 is an apocalyptic number.

1311375055 is a deficient number, since it is larger than the sum of its proper divisors (262275017).

1311375055 is an equidigital number, since it uses as much as digits as its factorization.

1311375055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262275016.

The product of its (nonzero) digits is 7875, while the sum is 31.

The square root of 1311375055 is about 36212.9128212576. The cubic root of 1311375055 is about 1094.5668880580.

The spelling of 1311375055 in words is "one billion, three hundred eleven million, three hundred seventy-five thousand, fifty-five".