100225661 has 2 divisors, whose sum is σ = 100225662. Its totient is φ = 100225660.

The previous prime is 100225613. The next prime is 100225669. The reversal of 100225661 is 166522001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100120036 + 105625 = 10006^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 100225661 - 2¹⁰ = 100224637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100225669) 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, 50112830 + 50112831.

It is an arithmetic number, because the mean of its divisors is an integer number (50112831).

Almost surely, 2^100225661 is an apocalyptic number.

It is an amenable number.

100225661 is a deficient number, since it is larger than the sum of its proper divisors (1).

100225661 is an equidigital number, since it uses as much as digits as its factorization.

100225661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 100225661 is about 10011.2766918111. The cubic root of 100225661 is about 464.5077629236.

Adding to 100225661 its reverse (166522001), we get a palindrome (266747662).

The spelling of 100225661 in words is "one hundred million, two hundred twenty-five thousand, six hundred sixty-one".