85251121 has 2 divisors, whose sum is σ = 85251122. Its totient is φ = 85251120.

The previous prime is 85251059. The next prime is 85251139. The reversal of 85251121 is 12115258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57214096 + 28037025 = 7564^2 + 5295^2 .

It is a cyclic number.

It is not a de Polignac number, because 85251121 - 2¹³ = 85242929 is a prime.

It is a super-3 number, since 3×85251121³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (85251421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42625560 + 42625561.

It is an arithmetic number, because the mean of its divisors is an integer number (42625561).

Almost surely, 2^85251121 is an apocalyptic number.

It is an amenable number.

85251121 is a deficient number, since it is larger than the sum of its proper divisors (1).

85251121 is an equidigital number, since it uses as much as digits as its factorization.

85251121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 25.

The square root of 85251121 is about 9233.1533616636. The cubic root of 85251121 is about 440.1155361197.

Adding to 85251121 its reverse (12115258), we get a palindrome (97366379).

The spelling of 85251121 in words is "eighty-five million, two hundred fifty-one thousand, one hundred twenty-one".