11311378538 has 4 divisors (see below), whose sum is σ = 16967067810. Its totient is φ = 5655689268.

The previous prime is 11311378511. The next prime is 11311378583. The reversal of 11311378538 is 83587311311.

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

It can be written as a sum of positive squares in only one way, i.e., 10340245969 + 971132569 = 101687^2 + 31163^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11311378495 and 11311378504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2827844633 + ... + 2827844636.

Almost surely, 2^11311378538 is an apocalyptic number.

11311378538 is a deficient number, since it is larger than the sum of its proper divisors (5655689272).

11311378538 is an equidigital number, since it uses as much as digits as its factorization.

11311378538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655689271.

The product of its digits is 60480, while the sum is 41.

Adding to 11311378538 its reverse (83587311311), we get a palindrome (94898689849).

The spelling of 11311378538 in words is "eleven billion, three hundred eleven million, three hundred seventy-eight thousand, five hundred thirty-eight".