850401121 has 2 divisors, whose sum is σ = 850401122. Its totient is φ = 850401120.

The previous prime is 850401091. The next prime is 850401137. The reversal of 850401121 is 121104058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810256225 + 40144896 = 28465^2 + 6336^2 .

It is a cyclic number.

It is not a de Polignac number, because 850401121 - 2⁵ = 850401089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 850401092 and 850401101.

It is not a weakly prime, because it can be changed into another prime (850401521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425200560 + 425200561.

It is an arithmetic number, because the mean of its divisors is an integer number (425200561).

Almost surely, 2^850401121 is an apocalyptic number.

It is an amenable number.

850401121 is a deficient number, since it is larger than the sum of its proper divisors (1).

850401121 is an equidigital number, since it uses as much as digits as its factorization.

850401121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 850401121 is about 29161.6378312330. The cubic root of 850401121 is about 947.4172212754.

Adding to 850401121 its reverse (121104058), we get a palindrome (971505179).

The spelling of 850401121 in words is "eight hundred fifty million, four hundred one thousand, one hundred twenty-one".