905254121 has 2 divisors, whose sum is σ = 905254122. Its totient is φ = 905254120.

The previous prime is 905254117. The next prime is 905254123. The reversal of 905254121 is 121452509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492351721 + 412902400 = 22189^2 + 20320^2 .

It is a cyclic number.

It is not a de Polignac number, because 905254121 - 2² = 905254117 is a prime.

Together with 905254123, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (905254123) 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, 452627060 + 452627061.

It is an arithmetic number, because the mean of its divisors is an integer number (452627061).

Almost surely, 2^905254121 is an apocalyptic number.

It is an amenable number.

905254121 is a deficient number, since it is larger than the sum of its proper divisors (1).

905254121 is an equidigital number, since it uses as much as digits as its factorization.

905254121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 905254121 is about 30087.4412504620. The cubic root of 905254121 is about 967.3645543932.

The spelling of 905254121 in words is "nine hundred five million, two hundred fifty-four thousand, one hundred twenty-one".