85125661 has 2 divisors, whose sum is σ = 85125662. Its totient is φ = 85125660.

The previous prime is 85125653. The next prime is 85125709. The reversal of 85125661 is 16652158.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73633561 + 11492100 = 8581^2 + 3390^2 .

It is a cyclic number.

It is not a de Polignac number, because 85125661 - 2³ = 85125653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85125611) 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, 42562830 + 42562831.

It is an arithmetic number, because the mean of its divisors is an integer number (42562831).

Almost surely, 2^85125661 is an apocalyptic number.

It is an amenable number.

85125661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85125661 is an equidigital number, since it uses as much as digits as its factorization.

85125661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 85125661 is about 9226.3568649820. The cubic root of 85125661 is about 439.8995311242.

The spelling of 85125661 in words is "eighty-five million, one hundred twenty-five thousand, six hundred sixty-one".