900211409 has 2 divisors, whose sum is σ = 900211410. Its totient is φ = 900211408.

The previous prime is 900211381. The next prime is 900211423. The reversal of 900211409 is 904112009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 898320784 + 1890625 = 29972^2 + 1375^2 .

It is an emirp because it is prime and its reverse (904112009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 900211409 - 2¹² = 900207313 is a prime.

It is not a weakly prime, because it can be changed into another prime (900211309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450105704 + 450105705.

It is an arithmetic number, because the mean of its divisors is an integer number (450105705).

Almost surely, 2^900211409 is an apocalyptic number.

It is an amenable number.

900211409 is a deficient number, since it is larger than the sum of its proper divisors (1).

900211409 is an equidigital number, since it uses as much as digits as its factorization.

900211409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 900211409 is about 30003.5232764421. The cubic root of 900211409 is about 965.5649761484.

The spelling of 900211409 in words is "nine hundred million, two hundred eleven thousand, four hundred nine".