11016391681 has 3 divisors (see below), whose sum is σ = 11016496641. Its totient is φ = 11016286722.

The previous prime is 11016391669. The next prime is 11016391693. The reversal of 11016391681 is 18619361011.

The square root of 11016391681 is 104959.

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 an interprime number because it is at equal distance from previous prime (11016391669) and next prime (11016391693).

It is not a de Polignac number, because 11016391681 - 2⁵ = 11016391649 is a prime.

It is a super-2 number, since 2×11016391681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11016391681.

It is not an unprimeable number, because it can be changed into a prime (11016391651) 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, 52480 + ... + 157438.

It is an arithmetic number, because the mean of its divisors is an integer number (3672165547).

Almost surely, 2^11016391681 is an apocalyptic number.

11016391681 is the 104959-th square number.

11016391681 is the 52480-th centered octagonal number.

It is an amenable number.

11016391681 is a deficient number, since it is larger than the sum of its proper divisors (104960).

11016391681 is an frugal number, since it uses more digits than its factorization.

11016391681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209918 (or 104959 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 11016391681 in words is "eleven billion, sixteen million, three hundred ninety-one thousand, six hundred eighty-one".