905922221 has 2 divisors, whose sum is σ = 905922222. Its totient is φ = 905922220.

The previous prime is 905922211. The next prime is 905922233. The reversal of 905922221 is 122229509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 794619721 + 111302500 = 28189^2 + 10550^2 .

It is an emirp because it is prime and its reverse (122229509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 905922221 - 2²² = 901727917 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 (905922211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452961110 + 452961111.

It is an arithmetic number, because the mean of its divisors is an integer number (452961111).

Almost surely, 2^905922221 is an apocalyptic number.

It is an amenable number.

905922221 is a deficient number, since it is larger than the sum of its proper divisors (1).

905922221 is an equidigital number, since it uses as much as digits as its factorization.

905922221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 905922221 is about 30098.5418417571. The cubic root of 905922221 is about 967.6024755525.

The spelling of 905922221 in words is "nine hundred five million, nine hundred twenty-two thousand, two hundred twenty-one".