1153805857 has 2 divisors, whose sum is σ = 1153805858. Its totient is φ = 1153805856.

The previous prime is 1153805831. The next prime is 1153805881. The reversal of 1153805857 is 7585083511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673713936 + 480091921 = 25956^2 + 21911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153805857 - 2⁷ = 1153805729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1153809857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 576902928 + 576902929.

It is an arithmetic number, because the mean of its divisors is an integer number (576902929).

Almost surely, 2^1153805857 is an apocalyptic number.

It is an amenable number.

1153805857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153805857 is an equidigital number, since it uses as much as digits as its factorization.

1153805857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168000, while the sum is 43.

The square root of 1153805857 is about 33967.7178656441. The cubic root of 1153805857 is about 1048.8440360844.

The spelling of 1153805857 in words is "one billion, one hundred fifty-three million, eight hundred five thousand, eight hundred fifty-seven".