855637889 has 2 divisors, whose sum is σ = 855637890. Its totient is φ = 855637888.

The previous prime is 855637859. The next prime is 855637903. The reversal of 855637889 is 988736558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432307264 + 423330625 = 20792^2 + 20575^2 .

It is a cyclic number.

It is not a de Polignac number, because 855637889 - 2¹⁶ = 855572353 is a prime.

It is not a weakly prime, because it can be changed into another prime (855637859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427818944 + 427818945.

It is an arithmetic number, because the mean of its divisors is an integer number (427818945).

Almost surely, 2^855637889 is an apocalyptic number.

It is an amenable number.

855637889 is a deficient number, since it is larger than the sum of its proper divisors (1).

855637889 is an equidigital number, since it uses as much as digits as its factorization.

855637889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 59.

The square root of 855637889 is about 29251.2886724671. The cubic root of 855637889 is about 949.3579739619.

The spelling of 855637889 in words is "eight hundred fifty-five million, six hundred thirty-seven thousand, eight hundred eighty-nine".