850221077 has 2 divisors, whose sum is σ = 850221078. Its totient is φ = 850221076.

The previous prime is 850221061. The next prime is 850221079. The reversal of 850221077 is 770122058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 798006001 + 52215076 = 28249^2 + 7226^2 .

It is a cyclic number.

It is not a de Polignac number, because 850221077 - 2⁴ = 850221061 is a prime.

Together with 850221079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850221079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425110538 + 425110539.

It is an arithmetic number, because the mean of its divisors is an integer number (425110539).

Almost surely, 2^850221077 is an apocalyptic number.

It is an amenable number.

850221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

850221077 is an equidigital number, since it uses as much as digits as its factorization.

850221077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 850221077 is about 29158.5506669999. The cubic root of 850221077 is about 947.3503552513.

The spelling of 850221077 in words is "eight hundred fifty million, two hundred twenty-one thousand, seventy-seven".