857129453909 has 2 divisors, whose sum is σ = 857129453910. Its totient is φ = 857129453908.

The previous prime is 857129453857. The next prime is 857129453963. The reversal of 857129453909 is 909354921758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603620224900 + 253509229009 = 776930^2 + 503497^2 .

It is a cyclic number.

It is not a de Polignac number, because 857129453909 - 2¹⁶ = 857129388373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857129453309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428564726954 + 428564726955.

It is an arithmetic number, because the mean of its divisors is an integer number (428564726955).

Almost surely, 2^857129453909 is an apocalyptic number.

It is an amenable number.

857129453909 is a deficient number, since it is larger than the sum of its proper divisors (1).

857129453909 is an equidigital number, since it uses as much as digits as its factorization.

857129453909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24494400, while the sum is 62.

The spelling of 857129453909 in words is "eight hundred fifty-seven billion, one hundred twenty-nine million, four hundred fifty-three thousand, nine hundred nine".