100865881 has 4 divisors (see below), whose sum is σ = 101019600. Its totient is φ = 100712164.

The previous prime is 100865803. The next prime is 100865893. The reversal of 100865881 is 188568001.

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: 188568001 = 2371 ⋅79531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100865881 is a prime.

It is a super-2 number, since 2×100865881² = 20347851899812322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100865881.

It is not an unprimeable number, because it can be changed into a prime (100865801) 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, 75871 + ... + 77188.

It is an arithmetic number, because the mean of its divisors is an integer number (25254900).

Almost surely, 2^100865881 is an apocalyptic number.

It is an amenable number.

100865881 is a deficient number, since it is larger than the sum of its proper divisors (153719).

100865881 is an equidigital number, since it uses as much as digits as its factorization.

100865881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153718.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 100865881 is about 10043.2007348255. The cubic root of 100865881 is about 465.4947230146.

The spelling of 100865881 in words is "one hundred million, eight hundred sixty-five thousand, eight hundred eighty-one".