100491289 has 8 divisors (see below), whose sum is σ = 102044520. Its totient is φ = 98942976.

The previous prime is 100491283. The next prime is 100491317. The reversal of 100491289 is 982194001.

It can be written as a sum of positive squares in 4 ways, for example, as 12131289 + 88360000 = 3483^2 + 9400^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100491289 - 2¹⁹ = 99967001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100491283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70617 + ... + 72025.

It is an arithmetic number, because the mean of its divisors is an integer number (12755565).

Almost surely, 2^100491289 is an apocalyptic number.

It is an amenable number.

100491289 is a deficient number, since it is larger than the sum of its proper divisors (1553231).

100491289 is an equidigital number, since it uses as much as digits as its factorization.

100491289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 100491289 is about 10024.5343532755. The cubic root of 100491289 is about 464.9177624637.

It can be divided in two parts, 1004912 and 89, that added together give a palindrome (1005001).

The spelling of 100491289 in words is "one hundred million, four hundred ninety-one thousand, two hundred eighty-nine".