108278581 has 4 divisors (see below), whose sum is σ = 110919564. Its totient is φ = 105637600.

The previous prime is 108278561. The next prime is 108278603. The reversal of 108278581 is 185872801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185872801 = 19 ⋅9782779.

It can be written as a sum of positive squares in 2 ways, for example, as 51351556 + 56927025 = 7166^2 + 7545^2 .

It is a cyclic number.

It is not a de Polignac number, because 108278581 - 2⁷ = 108278453 is a prime.

It is a super-2 number, since 2×108278581² = 23448502206747122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108278531) 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, 1320430 + ... + 1320511.

It is an arithmetic number, because the mean of its divisors is an integer number (27729891).

Almost surely, 2^108278581 is an apocalyptic number.

It is an amenable number.

108278581 is a deficient number, since it is larger than the sum of its proper divisors (2640983).

108278581 is an equidigital number, since it uses as much as digits as its factorization.

108278581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640982.

The product of its (nonzero) digits is 35840, while the sum is 40.

The square root of 108278581 is about 10405.6994478987. The cubic root of 108278581 is about 476.6294267830.

The spelling of 108278581 in words is "one hundred eight million, two hundred seventy-eight thousand, five hundred eighty-one".