901849909 has 2 divisors, whose sum is σ = 901849910. Its totient is φ = 901849908.

The previous prime is 901849873. The next prime is 901849913. The reversal of 901849909 is 909948109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728190225 + 173659684 = 26985^2 + 13178^2 .

It is a cyclic number.

It is not a de Polignac number, because 901849909 - 2¹¹ = 901847861 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 (901849939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450924954 + 450924955.

It is an arithmetic number, because the mean of its divisors is an integer number (450924955).

Almost surely, 2^901849909 is an apocalyptic number.

It is an amenable number.

901849909 is a deficient number, since it is larger than the sum of its proper divisors (1).

901849909 is an equidigital number, since it uses as much as digits as its factorization.

901849909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 901849909 is about 30030.8159895798. The cubic root of 901849909 is about 966.1504383725.

The spelling of 901849909 in words is "nine hundred one million, eight hundred forty-nine thousand, nine hundred nine".