100631213 has 2 divisors, whose sum is σ = 100631214. Its totient is φ = 100631212.

The previous prime is 100631197. The next prime is 100631221. The reversal of 100631213 is 312136001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61418569 + 39212644 = 7837^2 + 6262^2 .

It is an emirp because it is prime and its reverse (312136001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100631213 - 2⁴ = 100631197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100631191 and 100631200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100631263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50315606 + 50315607.

It is an arithmetic number, because the mean of its divisors is an integer number (50315607).

Almost surely, 2^100631213 is an apocalyptic number.

It is an amenable number.

100631213 is a deficient number, since it is larger than the sum of its proper divisors (1).

100631213 is an equidigital number, since it uses as much as digits as its factorization.

100631213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 100631213 is about 10031.5110028350. The cubic root of 100631213 is about 465.1334461104.

Adding to 100631213 its reverse (312136001), we get a palindrome (412767214).

The spelling of 100631213 in words is "one hundred million, six hundred thirty-one thousand, two hundred thirteen".