100420261 has 2 divisors, whose sum is σ = 100420262. Its totient is φ = 100420260.

The previous prime is 100420217. The next prime is 100420291. The reversal of 100420261 is 162024001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99880036 + 540225 = 9994^2 + 735^2 .

It is a cyclic number.

It is not a de Polignac number, because 100420261 - 2¹⁵ = 100387493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100420291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210130 + 50210131.

It is an arithmetic number, because the mean of its divisors is an integer number (50210131).

Almost surely, 2^100420261 is an apocalyptic number.

It is an amenable number.

100420261 is a deficient number, since it is larger than the sum of its proper divisors (1).

100420261 is an equidigital number, since it uses as much as digits as its factorization.

100420261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 100420261 is about 10020.9910188564. The cubic root of 100420261 is about 464.8082008545.

Adding to 100420261 its reverse (162024001), we get a palindrome (262444262).

The spelling of 100420261 in words is "one hundred million, four hundred twenty thousand, two hundred sixty-one".