100189861 has 4 divisors (see below), whose sum is σ = 103421824. Its totient is φ = 96957900.

The previous prime is 100189849. The next prime is 100189883. The reversal of 100189861 is 168981001.

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: 168981001 = 7 ⋅24140143.

It is a cyclic number.

It is not a de Polignac number, because 100189861 - 2¹⁵ = 100157093 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 (100189841) 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, 1615935 + ... + 1615996.

It is an arithmetic number, because the mean of its divisors is an integer number (25855456).

Almost surely, 2^100189861 is an apocalyptic number.

It is an amenable number.

100189861 is a deficient number, since it is larger than the sum of its proper divisors (3231963).

100189861 is an equidigital number, since it uses as much as digits as its factorization.

100189861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231962.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 100189861 is about 10009.4885483725. The cubic root of 100189861 is about 464.4524498827.

The spelling of 100189861 in words is "one hundred million, one hundred eighty-nine thousand, eight hundred sixty-one".