85240121 has 2 divisors, whose sum is σ = 85240122. Its totient is φ = 85240120.

The previous prime is 85240117. The next prime is 85240123. The reversal of 85240121 is 12104258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62094400 + 23145721 = 7880^2 + 4811^2 .

It is a cyclic number.

It is not a de Polignac number, because 85240121 - 2² = 85240117 is a prime.

Together with 85240123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85240123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42620060 + 42620061.

It is an arithmetic number, because the mean of its divisors is an integer number (42620061).

Almost surely, 2^85240121 is an apocalyptic number.

It is an amenable number.

85240121 is a deficient number, since it is larger than the sum of its proper divisors (1).

85240121 is an equidigital number, since it uses as much as digits as its factorization.

85240121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 85240121 is about 9232.5576629664. The cubic root of 85240121 is about 440.0966058539.

Adding to 85240121 its reverse (12104258), we get a palindrome (97344379).

The spelling of 85240121 in words is "eighty-five million, two hundred forty thousand, one hundred twenty-one".