11315089891681 has 3 divisors (see below), whose sum is σ = 11315093255473. Its totient is φ = 11315086527890.

The previous prime is 11315089891669. The next prime is 11315089891733. The reversal of 11315089891681 is 18619898051311.

The square root of 11315089891681 is 3363791.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 11315089891681 - 2¹¹ = 11315089889633 is a prime.

It is a super-2 number, since 2×11315089891681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11315089891621) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1681896 + ... + 5045686.

Almost surely, 2^{11315089891681} is an apocalyptic number.

11315089891681 is the 3363791-st square number.

11315089891681 is the 1681896-th centered octagonal number.

It is an amenable number.

11315089891681 is a deficient number, since it is larger than the sum of its proper divisors (3363792).

11315089891681 is an frugal number, since it uses more digits than its factorization.

11315089891681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6727582 (or 3363791 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 61.

The spelling of 11315089891681 in words is "eleven trillion, three hundred fifteen billion, eighty-nine million, eight hundred ninety-one thousand, six hundred eighty-one".