850291921 has 2 divisors, whose sum is σ = 850291922. Its totient is φ = 850291920.

The previous prime is 850291913. The next prime is 850291943. The reversal of 850291921 is 129192058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 720331921 + 129960000 = 26839^2 + 11400^2 .

It is a cyclic number.

It is not a de Polignac number, because 850291921 - 2³ = 850291913 is a prime.

It is not a weakly prime, because it can be changed into another prime (850241921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425145960 + 425145961.

It is an arithmetic number, because the mean of its divisors is an integer number (425145961).

Almost surely, 2^850291921 is an apocalyptic number.

It is an amenable number.

850291921 is a deficient number, since it is larger than the sum of its proper divisors (1).

850291921 is an equidigital number, since it uses as much as digits as its factorization.

850291921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 850291921 is about 29159.7654483022. The cubic root of 850291921 is about 947.3766669273.

The spelling of 850291921 in words is "eight hundred fifty million, two hundred ninety-one thousand, nine hundred twenty-one".