85144121 has 2 divisors, whose sum is σ = 85144122. Its totient is φ = 85144120.

The previous prime is 85144117. The next prime is 85144153. The reversal of 85144121 is 12144158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48372025 + 36772096 = 6955^2 + 6064^2 .

It is a cyclic number.

It is not a de Polignac number, because 85144121 - 2² = 85144117 is a prime.

It is not a weakly prime, because it can be changed into another prime (85144181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572060 + 42572061.

It is an arithmetic number, because the mean of its divisors is an integer number (42572061).

Almost surely, 2^85144121 is an apocalyptic number.

It is an amenable number.

85144121 is a deficient number, since it is larger than the sum of its proper divisors (1).

85144121 is an equidigital number, since it uses as much as digits as its factorization.

85144121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 26.

The square root of 85144121 is about 9227.3572056142. The cubic root of 85144121 is about 439.9313270924.

Adding to 85144121 its reverse (12144158), we get a palindrome (97288279).

The spelling of 85144121 in words is "eighty-five million, one hundred forty-four thousand, one hundred twenty-one".