909243121 has 2 divisors, whose sum is σ = 909243122. Its totient is φ = 909243120.

The previous prime is 909243091. The next prime is 909243133. The reversal of 909243121 is 121342909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464876721 + 444366400 = 21561^2 + 21080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-909243121 is a prime.

It is not a weakly prime, because it can be changed into another prime (909243421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454621560 + 454621561.

It is an arithmetic number, because the mean of its divisors is an integer number (454621561).

Almost surely, 2^909243121 is an apocalyptic number.

It is an amenable number.

909243121 is a deficient number, since it is larger than the sum of its proper divisors (1).

909243121 is an equidigital number, since it uses as much as digits as its factorization.

909243121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 909243121 is about 30153.6585010841. The cubic root of 909243121 is about 968.7833689179.

The spelling of 909243121 in words is "nine hundred nine million, two hundred forty-three thousand, one hundred twenty-one".