85390121 has 2 divisors, whose sum is σ = 85390122. Its totient is φ = 85390120.

The previous prime is 85390111. The next prime is 85390139. The reversal of 85390121 is 12109358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84842521 + 547600 = 9211^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85390121 is a prime.

It is not a weakly prime, because it can be changed into another prime (85390111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42695060 + 42695061.

It is an arithmetic number, because the mean of its divisors is an integer number (42695061).

Almost surely, 2^85390121 is an apocalyptic number.

It is an amenable number.

85390121 is a deficient number, since it is larger than the sum of its proper divisors (1).

85390121 is an equidigital number, since it uses as much as digits as its factorization.

85390121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 85390121 is about 9240.6775184507. The cubic root of 85390121 is about 440.3546056677.

Adding to 85390121 its reverse (12109358), we get a palindrome (97499479).

The spelling of 85390121 in words is "eighty-five million, three hundred ninety thousand, one hundred twenty-one".