100042861 has 4 divisors (see below), whose sum is σ = 100114300. Its totient is φ = 99971424.

The previous prime is 100042843. The next prime is 100042871. The reversal of 100042861 is 168240001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10361961 + 89680900 = 3219^2 + 9470^2 .

It is a cyclic number.

It is not a de Polignac number, because 100042861 - 2²³ = 91654253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100042871) 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, 33576 + ... + 36433.

It is an arithmetic number, because the mean of its divisors is an integer number (25028575).

Almost surely, 2^100042861 is an apocalyptic number.

It is an amenable number.

100042861 is a deficient number, since it is larger than the sum of its proper divisors (71439).

100042861 is an equidigital number, since it uses as much as digits as its factorization.

100042861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71438.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 100042861 is about 10002.1428204160. The cubic root of 100042861 is about 464.2251882689.

Adding to 100042861 its reverse (168240001), we get a palindrome (268282862).

The spelling of 100042861 in words is "one hundred million, forty-two thousand, eight hundred sixty-one".