108857981 has 4 divisors (see below), whose sum is σ = 110391264. Its totient is φ = 107324700.

The previous prime is 108857951. The next prime is 108858023. The reversal of 108857981 is 189758801.

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: 189758801 = 149 ⋅1273549.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108857981 is a prime.

It is a super-2 number, since 2×108857981² = 23700120054792722, 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 (108857921) 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, 766535 + ... + 766676.

It is an arithmetic number, because the mean of its divisors is an integer number (27597816).

Almost surely, 2^108857981 is an apocalyptic number.

It is an amenable number.

108857981 is a deficient number, since it is larger than the sum of its proper divisors (1533283).

108857981 is an equidigital number, since it uses as much as digits as its factorization.

108857981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533282.

The product of its (nonzero) digits is 161280, while the sum is 47.

The square root of 108857981 is about 10433.5028154499. The cubic root of 108857981 is about 477.4780648349.

The spelling of 108857981 in words is "one hundred eight million, eight hundred fifty-seven thousand, nine hundred eighty-one".