1311531138794 has 8 divisors (see below), whose sum is σ = 2013047794560. Its totient is φ = 640515207276.

The previous prime is 1311531138763. The next prime is 1311531138817. The reversal of 1311531138794 is 4978311351131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1311531138794² (a number of 25 digits) contains 22 as substring.

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, 7625180954 + ... + 7625181125.

It is an arithmetic number, because the mean of its divisors is an integer number (251630974320).

Almost surely, 2^{1311531138794} is an apocalyptic number.

1311531138794 is a deficient number, since it is larger than the sum of its proper divisors (701516655766).

1311531138794 is a wasteful number, since it uses less digits than its factorization.

1311531138794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15250362124.

The product of its digits is 272160, while the sum is 47.

Adding to 1311531138794 its sum of digits (47), we get a square (1311531138841 = 1145221²).

The spelling of 1311531138794 in words is "one trillion, three hundred eleven billion, five hundred thirty-one million, one hundred thirty-eight thousand, seven hundred ninety-four".