111531559 has 2 divisors, whose sum is σ = 111531560. Its totient is φ = 111531558.

The previous prime is 111531547. The next prime is 111531569. The reversal of 111531559 is 955135111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111531559 - 2¹¹ = 111529511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111531559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111531569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55765779 + 55765780.

It is an arithmetic number, because the mean of its divisors is an integer number (55765780).

Almost surely, 2^111531559 is an apocalyptic number.

111531559 is a deficient number, since it is larger than the sum of its proper divisors (1).

111531559 is an equidigital number, since it uses as much as digits as its factorization.

111531559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3375, while the sum is 31.

The square root of 111531559 is about 10560.8502972062. The cubic root of 111531559 is about 481.3554842929.

The spelling of 111531559 in words is "one hundred eleven million, five hundred thirty-one thousand, five hundred fifty-nine".