901909 has 2 divisors, whose sum is σ = 901910. Its totient is φ = 901908.

The previous prime is 901907. The next prime is 901919. The reversal of 901909 is 909109.

901909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459684 + 442225 = 678^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 901909 - 2¹ = 901907 is a prime.

Together with 901907, it forms a pair of twin primes.

901909 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450954 + 450955.

It is an arithmetic number, because the mean of its divisors is an integer number (450955).

2⁹⁰¹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

901909 is a deficient number, since it is larger than the sum of its proper divisors (1).

901909 is an equidigital number, since it uses as much as digits as its factorization.

901909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 901909 is about 949.6888964287. The cubic root of 901909 is about 96.6171539278.

The spelling of 901909 in words is "nine hundred one thousand, nine hundred nine".