108315781 has 4 divisors (see below), whose sum is σ = 123789472. Its totient is φ = 92842092.

The previous prime is 108315769. The next prime is 108315793. The reversal of 108315781 is 187513801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 187513801 = 211 ⋅888691.

It is an interprime number because it is at equal distance from previous prime (108315769) and next prime (108315793).

It is not a de Polignac number, because 108315781 - 2⁵ = 108315749 is a prime.

It is a super-2 number, since 2×108315781² = 23464616827279922, 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 (108315731) 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, 7736835 + ... + 7736848.

It is an arithmetic number, because the mean of its divisors is an integer number (30947368).

Almost surely, 2^108315781 is an apocalyptic number.

It is an amenable number.

108315781 is a deficient number, since it is larger than the sum of its proper divisors (15473691).

108315781 is an equidigital number, since it uses as much as digits as its factorization.

108315781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15473690.

The product of its (nonzero) digits is 6720, while the sum is 34.

The square root of 108315781 is about 10407.4867763548. The cubic root of 108315781 is about 476.6840038575.

The spelling of 108315781 in words is "one hundred eight million, three hundred fifteen thousand, seven hundred eighty-one".