100116521 has 4 divisors (see below), whose sum is σ = 100191444. Its totient is φ = 100041600.

The previous prime is 100116503. The next prime is 100116551. The reversal of 100116521 is 125611001.

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 12880921 + 87235600 = 3589^2 + 9340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100116521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 100116521.

It is not an unprimeable number, because it can be changed into a prime (100116551) 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, 35420 + ... + 38141.

It is an arithmetic number, because the mean of its divisors is an integer number (25047861).

Almost surely, 2^100116521 is an apocalyptic number.

It is an amenable number.

100116521 is a deficient number, since it is larger than the sum of its proper divisors (74923).

100116521 is an equidigital number, since it uses as much as digits as its factorization.

100116521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74922.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 100116521 is about 10005.8243538451. The cubic root of 100116521 is about 464.3390942424.

Adding to 100116521 its reverse (125611001), we get a palindrome (225727522).

The spelling of 100116521 in words is "one hundred million, one hundred sixteen thousand, five hundred twenty-one".