85123501 has 2 divisors, whose sum is σ = 85123502. Its totient is φ = 85123500.

The previous prime is 85123481. The next prime is 85123517. The reversal of 85123501 is 10532158.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78747876 + 6375625 = 8874^2 + 2525^2 .

It is a cyclic number.

It is not a de Polignac number, because 85123501 - 2⁵ = 85123469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85123561) 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, 42561750 + 42561751.

It is an arithmetic number, because the mean of its divisors is an integer number (42561751).

Almost surely, 2^85123501 is an apocalyptic number.

It is an amenable number.

85123501 is a deficient number, since it is larger than the sum of its proper divisors (1).

85123501 is an equidigital number, since it uses as much as digits as its factorization.

85123501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 85123501 is about 9226.2398082859. The cubic root of 85123501 is about 439.8958103855.

Adding to 85123501 its reverse (10532158), we get a palindrome (95655659).

The spelling of 85123501 in words is "eighty-five million, one hundred twenty-three thousand, five hundred one".