916538881 has 4 divisors (see below), whose sum is σ = 948143700. Its totient is φ = 884934064.

The previous prime is 916538813. The next prime is 916538893. The reversal of 916538881 is 188835619.

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

It can be written as a sum of positive squares in 2 ways, for example, as 245987856 + 670551025 = 15684^2 + 25895^2 .

It is a cyclic number.

It is not a de Polignac number, because 916538881 - 2¹¹ = 916536833 is a prime.

It is a super-2 number, since 2×916538881² = 1680087040769464322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (916538801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15802366 + ... + 15802423.

It is an arithmetic number, because the mean of its divisors is an integer number (237035925).

Almost surely, 2^916538881 is an apocalyptic number.

It is an amenable number.

916538881 is a deficient number, since it is larger than the sum of its proper divisors (31604819).

916538881 is a wasteful number, since it uses less digits than its factorization.

916538881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31604818.

The product of its digits is 414720, while the sum is 49.

The square root of 916538881 is about 30274.3931565936. The cubic root of 916538881 is about 971.3676393061.

The spelling of 916538881 in words is "nine hundred sixteen million, five hundred thirty-eight thousand, eight hundred eighty-one".