850522921 has 2 divisors, whose sum is σ = 850522922. Its totient is φ = 850522920.

The previous prime is 850522909. The next prime is 850522943. The reversal of 850522921 is 129225058.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601230400 + 249292521 = 24520^2 + 15789^2 .

It is a cyclic number.

It is not a de Polignac number, because 850522921 - 2⁷ = 850522793 is a prime.

It is not a weakly prime, because it can be changed into another prime (850522721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425261460 + 425261461.

It is an arithmetic number, because the mean of its divisors is an integer number (425261461).

Almost surely, 2^850522921 is an apocalyptic number.

It is an amenable number.

850522921 is a deficient number, since it is larger than the sum of its proper divisors (1).

850522921 is an equidigital number, since it uses as much as digits as its factorization.

850522921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 850522921 is about 29163.7261165304. The cubic root of 850522921 is about 947.4624508758.

Adding to 850522921 its reverse (129225058), we get a palindrome (979747979).

The spelling of 850522921 in words is "eight hundred fifty million, five hundred twenty-two thousand, nine hundred twenty-one".