100780213 has 4 divisors (see below), whose sum is σ = 100903788. Its totient is φ = 100656640.

The previous prime is 100780171. The next prime is 100780217. The reversal of 100780213 is 312087001.

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 28751044 + 72029169 = 5362^2 + 8487^2 .

It is a cyclic number.

It is not a de Polignac number, because 100780213 - 2¹⁷ = 100649141 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 (100780217) 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, 60556 + ... + 62197.

It is an arithmetic number, because the mean of its divisors is an integer number (25225947).

Almost surely, 2^100780213 is an apocalyptic number.

It is an amenable number.

100780213 is a deficient number, since it is larger than the sum of its proper divisors (123575).

100780213 is an equidigital number, since it uses as much as digits as its factorization.

100780213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123574.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 100780213 is about 10038.9348538578. The cubic root of 100780213 is about 465.3629001204.

The spelling of 100780213 in words is "one hundred million, seven hundred eighty thousand, two hundred thirteen".