100287861 has 4 divisors (see below), whose sum is σ = 133717152. Its totient is φ = 66858572.

The previous prime is 100287853. The next prime is 100287881. The reversal of 100287861 is 168782001.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 100287861 - 2³ = 100287853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100287851) 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, 16714641 + ... + 16714646.

It is an arithmetic number, because the mean of its divisors is an integer number (33429288).

Almost surely, 2^100287861 is an apocalyptic number.

It is an amenable number.

100287861 is a deficient number, since it is larger than the sum of its proper divisors (33429291).

100287861 is an equidigital number, since it uses as much as digits as its factorization.

100287861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33429290.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 100287861 is about 10014.3827068871. The cubic root of 100287861 is about 464.6038341551.

The spelling of 100287861 in words is "one hundred million, two hundred eighty-seven thousand, eight hundred sixty-one".