108906901 has 4 divisors (see below), whose sum is σ = 108928204. Its totient is φ = 108885600.

The previous prime is 108906887. The next prime is 108906907. The reversal of 108906901 is 109609801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109609801 = 7 ⋅15658543.

It can be written as a sum of positive squares in 2 ways, for example, as 66994225 + 41912676 = 8185^2 + 6474^2 .

It is a 3-Lehmer number, since φ(108906901) divides (108906901-1)³.

It is a cyclic number.

It is not a de Polignac number, because 108906901 - 2¹⁵ = 108874133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108906907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (27232051).

Almost surely, 2^108906901 is an apocalyptic number.

108906901 is the 8521-st pentagonal number.

It is an amenable number.

108906901 is a deficient number, since it is larger than the sum of its proper divisors (21303).

108906901 is an equidigital number, since it uses as much as digits as its factorization.

108906901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21302.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 108906901 is about 10435.8469229862. The cubic root of 108906901 is about 477.5495792018.

The spelling of 108906901 in words is "one hundred eight million, nine hundred six thousand, nine hundred one".