108181531 has 2 divisors, whose sum is σ = 108181532. Its totient is φ = 108181530.

The previous prime is 108181529. The next prime is 108181559. The reversal of 108181531 is 135181801.

It is an a-pointer prime, because the next prime (108181559) can be obtained adding 108181531 to its sum of digits (28).

It is a weak prime.

It is an emirp because it is prime and its reverse (135181801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108181531 - 2¹ = 108181529 is a prime.

It is a super-2 number, since 2×108181531² = 23406487299007922, which contains 22 as substring.

Together with 108181529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 108181531.

It is not a weakly prime, because it can be changed into another prime (108781531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54090765 + 54090766.

It is an arithmetic number, because the mean of its divisors is an integer number (54090766).

Almost surely, 2^108181531 is an apocalyptic number.

108181531 is a deficient number, since it is larger than the sum of its proper divisors (1).

108181531 is an equidigital number, since it uses as much as digits as its factorization.

108181531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 28.

The square root of 108181531 is about 10401.0350927203. The cubic root of 108181531 is about 476.4869833673.

The spelling of 108181531 in words is "one hundred eight million, one hundred eighty-one thousand, five hundred thirty-one".