1116161281 has 3 divisors (see below), whose sum is σ = 1116194691. Its totient is φ = 1116127872.

The previous prime is 1116161279. The next prime is 1116161287. The reversal of 1116161281 is 1821616111.

The square root of 1116161281 is 33409.

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 can be written as a sum of positive squares in only one way, i.e., 179801281 + 936360000 = 13409^2 + 30600^2 .

It is not a de Polignac number, because 1116161281 - 2¹ = 1116161279 is a prime.

It is a super-2 number, since 2×1116161281² = 2491632010407121922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1116161287) 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, 16705 + ... + 50113.

It is an arithmetic number, because the mean of its divisors is an integer number (372064897).

Almost surely, 2^1116161281 is an apocalyptic number.

1116161281 is the 33409-th square number.

1116161281 is the 16705-th centered octagonal number.

It is an amenable number.

1116161281 is a deficient number, since it is larger than the sum of its proper divisors (33410).

1116161281 is an frugal number, since it uses more digits than its factorization.

1116161281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66818 (or 33409 counting only the distinct ones).

The product of its digits is 576, while the sum is 28.

The cubic root of 1116161281 is about 1037.3110024144.

Multiplying 1116161281 by its product of digits (576), we get a square (642908897856 = 801816²).

Adding to 1116161281 its reverse (1821616111), we get a palindrome (2937777392).

The spelling of 1116161281 in words is "one billion, one hundred sixteen million, one hundred sixty-one thousand, two hundred eighty-one".