85558861 has 2 divisors, whose sum is σ = 85558862. Its totient is φ = 85558860.

The previous prime is 85558831. The next prime is 85558901. The reversal of 85558861 is 16885558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77774761 + 7784100 = 8819^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 85558861 - 2¹⁷ = 85427789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85558831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42779430 + 42779431.

It is an arithmetic number, because the mean of its divisors is an integer number (42779431).

Almost surely, 2^85558861 is an apocalyptic number.

It is an amenable number.

85558861 is a deficient number, since it is larger than the sum of its proper divisors (1).

85558861 is an equidigital number, since it uses as much as digits as its factorization.

85558861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384000, while the sum is 46.

The square root of 85558861 is about 9249.8032952058. The cubic root of 85558861 is about 440.6444773913.

The spelling of 85558861 in words is "eighty-five million, five hundred fifty-eight thousand, eight hundred sixty-one".