905215121 has 8 divisors (see below), whose sum is σ = 917343840. Its totient is φ = 893166912.

The previous prime is 905215063. The next prime is 905215123. The reversal of 905215121 is 121512509.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 905215121 - 2¹⁴ = 905198737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (905215123) 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 in 7 ways as a sum of consecutive naturals, for example, 2681 + ... + 42633.

It is an arithmetic number, because the mean of its divisors is an integer number (114667980).

Almost surely, 2^905215121 is an apocalyptic number.

It is an amenable number.

905215121 is a deficient number, since it is larger than the sum of its proper divisors (12128719).

905215121 is a wasteful number, since it uses less digits than its factorization.

905215121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40255.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 905215121 is about 30086.7931325357. The cubic root of 905215121 is about 967.3506622501.

The spelling of 905215121 in words is "nine hundred five million, two hundred fifteen thousand, one hundred twenty-one".