111681481 has 2 divisors, whose sum is σ = 111681482. Its totient is φ = 111681480.

The previous prime is 111681473. The next prime is 111681497. The reversal of 111681481 is 184186111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80712256 + 30969225 = 8984^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 111681481 - 2³ = 111681473 is a prime.

It is a super-2 number, since 2×111681481² = 24945506396706722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111681421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55840740 + 55840741.

It is an arithmetic number, because the mean of its divisors is an integer number (55840741).

Almost surely, 2^111681481 is an apocalyptic number.

It is an amenable number.

111681481 is a deficient number, since it is larger than the sum of its proper divisors (1).

111681481 is an equidigital number, since it uses as much as digits as its factorization.

111681481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 31.

The square root of 111681481 is about 10567.9459215119. The cubic root of 111681481 is about 481.5710689111.

The spelling of 111681481 in words is "one hundred eleven million, six hundred eighty-one thousand, four hundred eighty-one".