1318051687231 has 4 divisors (see below), whose sum is σ = 1375358282352. Its totient is φ = 1260745092112.

The previous prime is 1318051687223. The next prime is 1318051687237. The reversal of 1318051687231 is 1327861508131.

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

It is a cyclic number.

It is not a de Polignac number, because 1318051687231 - 2³ = 1318051687223 is a prime.

It is a super-2 number, since 2×1318051687231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318051687237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28653297526 + ... + 28653297571.

It is an arithmetic number, because the mean of its divisors is an integer number (343839570588).

Almost surely, 2^{1318051687231} is an apocalyptic number.

1318051687231 is a deficient number, since it is larger than the sum of its proper divisors (57306595121).

1318051687231 is an equidigital number, since it uses as much as digits as its factorization.

1318051687231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57306595120.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 1318051687231 in words is "one trillion, three hundred eighteen billion, fifty-one million, six hundred eighty-seven thousand, two hundred thirty-one".