900910921 has 2 divisors, whose sum is σ = 900910922. Its totient is φ = 900910920.

The previous prime is 900910873. The next prime is 900910939. The reversal of 900910921 is 129019009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661775625 + 239135296 = 25725^2 + 15464^2 .

It is a cyclic number.

It is not a de Polignac number, because 900910921 - 2⁷ = 900910793 is a prime.

It is not a weakly prime, because it can be changed into another prime (900310921) 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, 450455460 + 450455461.

It is an arithmetic number, because the mean of its divisors is an integer number (450455461).

Almost surely, 2^900910921 is an apocalyptic number.

It is an amenable number.

900910921 is a deficient number, since it is larger than the sum of its proper divisors (1).

900910921 is an equidigital number, since it uses as much as digits as its factorization.

900910921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 900910921 is about 30015.1781770490. The cubic root of 900910921 is about 965.8150097921.

The spelling of 900910921 in words is "nine hundred million, nine hundred ten thousand, nine hundred twenty-one".