1311255243 has 8 divisors (see below), whose sum is σ = 1942600400. Its totient is φ = 874170144.

The previous prime is 1311255233. The next prime is 1311255259. The reversal of 1311255243 is 3425521131.

1311255243 is a `hidden beast` number, since 13 + 1 + 125 + 524 + 3 = 666.

It is not a de Polignac number, because 1311255243 - 2²⁵ = 1277700811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 48565009 = 1311255243 / (1 + 3 + 1 + 1 + 2 + 5 + 5 + 2 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311255223) 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, 24282478 + ... + 24282531.

It is an arithmetic number, because the mean of its divisors is an integer number (242825050).

Almost surely, 2^1311255243 is an apocalyptic number.

1311255243 is a deficient number, since it is larger than the sum of its proper divisors (631345157).

1311255243 is an equidigital number, since it uses as much as digits as its factorization.

1311255243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48565018 (or 48565012 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1311255243 is about 36211.2585116839. The cubic root of 1311255243 is about 1094.5335525040.

Adding to 1311255243 its reverse (3425521131), we get a palindrome (4736776374).

The spelling of 1311255243 in words is "one billion, three hundred eleven million, two hundred fifty-five thousand, two hundred forty-three".