90200261 has 2 divisors, whose sum is σ = 90200262. Its totient is φ = 90200260.

The previous prime is 90200233. The next prime is 90200267. The reversal of 90200261 is 16200209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70040161 + 20160100 = 8369^2 + 4490^2 .

It is an emirp because it is prime and its reverse (16200209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90200261 - 2¹⁰ = 90199237 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 (90200267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45100130 + 45100131.

It is an arithmetic number, because the mean of its divisors is an integer number (45100131).

Almost surely, 2^90200261 is an apocalyptic number.

It is an amenable number.

90200261 is a deficient number, since it is larger than the sum of its proper divisors (1).

90200261 is an equidigital number, since it uses as much as digits as its factorization.

90200261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 90200261 is about 9497.3817971060. The cubic root of 90200261 is about 448.4726175342.

The spelling of 90200261 in words is "ninety million, two hundred thousand, two hundred sixty-one".