853788889 has 2 divisors, whose sum is σ = 853788890. Its totient is φ = 853788888.

The previous prime is 853788863. The next prime is 853788907. The reversal of 853788889 is 988887358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 576000000 + 277788889 = 24000^2 + 16667^2 .

It is a cyclic number.

It is not a de Polignac number, because 853788889 - 2⁵ = 853788857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 853788889.

It is not a weakly prime, because it can be changed into another prime (853788829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426894444 + 426894445.

It is an arithmetic number, because the mean of its divisors is an integer number (426894445).

Almost surely, 2^853788889 is an apocalyptic number.

It is an amenable number.

853788889 is a deficient number, since it is larger than the sum of its proper divisors (1).

853788889 is an equidigital number, since it uses as much as digits as its factorization.

853788889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30965760, while the sum is 64.

The square root of 853788889 is about 29219.6661343007. Note that the first 3 decimals coincide. The cubic root of 853788889 is about 948.6736389724.

The spelling of 853788889 in words is "eight hundred fifty-three million, seven hundred eighty-eight thousand, eight hundred eighty-nine".