85555901 has 2 divisors, whose sum is σ = 85555902. Its totient is φ = 85555900.

The previous prime is 85555867. The next prime is 85555903. The reversal of 85555901 is 10955558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 25260676 = 7765^2 + 5026^2 .

It is a cyclic number.

It is not a de Polignac number, because 85555901 - 2¹⁰ = 85554877 is a prime.

Together with 85555903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85555903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42777950 + 42777951.

It is an arithmetic number, because the mean of its divisors is an integer number (42777951).

Almost surely, 2^85555901 is an apocalyptic number.

It is an amenable number.

85555901 is a deficient number, since it is larger than the sum of its proper divisors (1).

85555901 is an equidigital number, since it uses as much as digits as its factorization.

85555901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 38.

The square root of 85555901 is about 9249.6432904194. The cubic root of 85555901 is about 440.6393958109.

The spelling of 85555901 in words is "eighty-five million, five hundred fifty-five thousand, nine hundred one".