111631331 has 16 divisors (see below), whose sum is σ = 131576064. Its totient is φ = 92708064.

The previous prime is 111631319. The next prime is 111631337. The reversal of 111631331 is 133136111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111631331 - 2¹⁸ = 111369187 is a prime.

It is a super-2 number, since 2×111631331² = 24923108121663122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111631337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72536 + ... + 74058.

It is an arithmetic number, because the mean of its divisors is an integer number (8223504).

Almost surely, 2^111631331 is an apocalyptic number.

111631331 is a deficient number, since it is larger than the sum of its proper divisors (19944733).

111631331 is a wasteful number, since it uses less digits than its factorization.

111631331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850.

The product of its digits is 162, while the sum is 20.

The square root of 111631331 is about 10565.5729139503. The cubic root of 111631331 is about 481.4989757741.

Adding to 111631331 its reverse (133136111), we get a palindrome (244767442).

The spelling of 111631331 in words is "one hundred eleven million, six hundred thirty-one thousand, three hundred thirty-one".