100243261 has 2 divisors, whose sum is σ = 100243262. Its totient is φ = 100243260.

The previous prime is 100243229. The next prime is 100243289. The reversal of 100243261 is 162342001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90440100 + 9803161 = 9510^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 100243261 - 2⁵ = 100243229 is a prime.

It is a super-2 number, since 2×100243261² = 20097422751828242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100243201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50121630 + 50121631.

It is an arithmetic number, because the mean of its divisors is an integer number (50121631).

Almost surely, 2^100243261 is an apocalyptic number.

It is an amenable number.

100243261 is a deficient number, since it is larger than the sum of its proper divisors (1).

100243261 is an equidigital number, since it uses as much as digits as its factorization.

100243261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 100243261 is about 10012.1556619941. The cubic root of 100243261 is about 464.5349510976.

Adding to 100243261 its reverse (162342001), we get a palindrome (262585262).

The spelling of 100243261 in words is "one hundred million, two hundred forty-three thousand, two hundred sixty-one".