100870489 has 4 divisors (see below), whose sum is σ = 100952500. Its totient is φ = 100788480.

The previous prime is 100870477. The next prime is 100870519. The reversal of 100870489 is 984078001.

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 32262400 + 68608089 = 5680^2 + 8283^2 .

It is a cyclic number.

It is not a de Polignac number, because 100870489 - 2⁵ = 100870457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100870409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39132 + ... + 41629.

It is an arithmetic number, because the mean of its divisors is an integer number (25238125).

Almost surely, 2^100870489 is an apocalyptic number.

It is an amenable number.

100870489 is a deficient number, since it is larger than the sum of its proper divisors (82011).

100870489 is an equidigital number, since it uses as much as digits as its factorization.

100870489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82010.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 100870489 is about 10043.4301411420. The cubic root of 100870489 is about 465.5018115265.

It can be divided in two parts, 100 and 870489, that multiplied together give a square (87048900 = 9330²).

The spelling of 100870489 in words is "one hundred million, eight hundred seventy thousand, four hundred eighty-nine".