111731481 has 20 divisors (see below), whose sum is σ = 167851684. Its totient is φ = 74066400.

The previous prime is 111731479. The next prime is 111731483. The reversal of 111731481 is 184137111.

111731481 is a `hidden beast` number, since 11 + 173 + 1 + 481 = 666.

It is an interprime number because it is at equal distance from previous prime (111731479) and next prime (111731483).

It can be written as a sum of positive squares in 2 ways, for example, as 42575625 + 69155856 = 6525^2 + 8316^2 .

It is not a de Polignac number, because 111731481 - 2¹ = 111731479 is a prime.

It is a super-2 number, since 2×111731481² = 24967847692906722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111731483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10851 + ... + 18471.

Almost surely, 2^111731481 is an apocalyptic number.

It is an amenable number.

111731481 is a deficient number, since it is larger than the sum of its proper divisors (56120203).

111731481 is an equidigital number, since it uses as much as digits as its factorization.

111731481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7814 (or 7805 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 111731481 is about 10570.3113009977. The cubic root of 111731481 is about 481.6429249335.

Adding to 111731481 its reverse (184137111), we get a palindrome (295868592).

The spelling of 111731481 in words is "one hundred eleven million, seven hundred thirty-one thousand, four hundred eighty-one".