111541531 has 2 divisors, whose sum is σ = 111541532. Its totient is φ = 111541530.

The previous prime is 111541519. The next prime is 111541583. The reversal of 111541531 is 135145111.

It is a weak prime.

It is an emirp because it is prime and its reverse (135145111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111541531 - 2⁵ = 111541499 is a prime.

It is a super-2 number, since 2×111541531² = 24883026275647922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111545531) 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 as a sum of consecutive naturals, namely, 55770765 + 55770766.

It is an arithmetic number, because the mean of its divisors is an integer number (55770766).

Almost surely, 2^111541531 is an apocalyptic number.

111541531 is a deficient number, since it is larger than the sum of its proper divisors (1).

111541531 is an equidigital number, since it uses as much as digits as its factorization.

111541531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 300, while the sum is 22.

The square root of 111541531 is about 10561.3224077291. The cubic root of 111541531 is about 481.3698298106.

Adding to 111541531 its reverse (135145111), we get a palindrome (246686642).

The spelling of 111541531 in words is "one hundred eleven million, five hundred forty-one thousand, five hundred thirty-one".