111339581 has 2 divisors, whose sum is σ = 111339582. Its totient is φ = 111339580.

The previous prime is 111339551. The next prime is 111339587. The reversal of 111339581 is 185933111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104755225 + 6584356 = 10235^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 111339581 - 2⁶ = 111339517 is a prime.

It is a super-2 number, since 2×111339581² = 24793004594511122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111339587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55669790 + 55669791.

It is an arithmetic number, because the mean of its divisors is an integer number (55669791).

Almost surely, 2^111339581 is an apocalyptic number.

It is an amenable number.

111339581 is a deficient number, since it is larger than the sum of its proper divisors (1).

111339581 is an equidigital number, since it uses as much as digits as its factorization.

111339581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 32.

The square root of 111339581 is about 10551.7572470181. The cubic root of 111339581 is about 481.0791417761.

The spelling of 111339581 in words is "one hundred eleven million, three hundred thirty-nine thousand, five hundred eighty-one".