857187013 has 2 divisors, whose sum is σ = 857187014. Its totient is φ = 857187012.

The previous prime is 857186999. The next prime is 857187053. The reversal of 857187013 is 310781758.

857187013 = 20702² + 20703².

It is a happy number.

857187013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (857187053) can be obtained adding 857187013 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 428614209 + 428572804 = 20703^2 + 20702^2 .

It is a cyclic number.

It is not a de Polignac number, because 857187013 - 2¹³ = 857178821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857187053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428593506 + 428593507.

It is an arithmetic number, because the mean of its divisors is an integer number (428593507).

Almost surely, 2^857187013 is an apocalyptic number.

857187013 is the 20703-rd centered square number.

It is an amenable number.

857187013 is a deficient number, since it is larger than the sum of its proper divisors (1).

857187013 is an equidigital number, since it uses as much as digits as its factorization.

857187013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 40.

The square root of 857187013 is about 29277.7562835679. The cubic root of 857187013 is about 949.9305629766.

The spelling of 857187013 in words is "eight hundred fifty-seven million, one hundred eighty-seven thousand, thirteen".