100621253 has 2 divisors, whose sum is σ = 100621254. Its totient is φ = 100621252.

The previous prime is 100621217. The next prime is 100621259. The reversal of 100621253 is 352126001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93741124 + 6880129 = 9682^2 + 2623^2 .

It is a cyclic number.

It is not a de Polignac number, because 100621253 - 2¹⁴ = 100604869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100621259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50310626 + 50310627.

It is an arithmetic number, because the mean of its divisors is an integer number (50310627).

Almost surely, 2^100621253 is an apocalyptic number.

It is an amenable number.

100621253 is a deficient number, since it is larger than the sum of its proper divisors (1).

100621253 is an equidigital number, since it uses as much as digits as its factorization.

100621253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 100621253 is about 10031.0145548693. The cubic root of 100621253 is about 465.1181000369.

Adding to 100621253 its reverse (352126001), we get a palindrome (452747254).

The spelling of 100621253 in words is "one hundred million, six hundred twenty-one thousand, two hundred fifty-three".