85237661 has 2 divisors, whose sum is σ = 85237662. Its totient is φ = 85237660.

The previous prime is 85237651. The next prime is 85237681. The reversal of 85237661 is 16673258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80371225 + 4866436 = 8965^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 85237661 - 2¹⁰ = 85236637 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85237651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42618830 + 42618831.

It is an arithmetic number, because the mean of its divisors is an integer number (42618831).

Almost surely, 2^85237661 is an apocalyptic number.

It is an amenable number.

85237661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85237661 is an equidigital number, since it uses as much as digits as its factorization.

85237661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 85237661 is about 9232.4244378170. The cubic root of 85237661 is about 440.0923721353.

The spelling of 85237661 in words is "eighty-five million, two hundred thirty-seven thousand, six hundred sixty-one".