111008531 has 2 divisors, whose sum is σ = 111008532. Its totient is φ = 111008530.

The previous prime is 111008519. The next prime is 111008533. The reversal of 111008531 is 135800111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111008531 - 2⁶ = 111008467 is a prime.

It is a super-2 number, since 2×111008531² = 24645787909555922, which contains 22 as substring.

Together with 111008533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111008533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55504265 + 55504266.

It is an arithmetic number, because the mean of its divisors is an integer number (55504266).

Almost surely, 2^111008531 is an apocalyptic number.

111008531 is a deficient number, since it is larger than the sum of its proper divisors (1).

111008531 is an equidigital number, since it uses as much as digits as its factorization.

111008531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 111008531 is about 10536.0586084171. The cubic root of 111008531 is about 480.6018650956.

Adding to 111008531 its reverse (135800111), we get a palindrome (246808642).

The spelling of 111008531 in words is "one hundred eleven million, eight thousand, five hundred thirty-one".