857128537 has 2 divisors, whose sum is σ = 857128538. Its totient is φ = 857128536.

The previous prime is 857128499. The next prime is 857128549. The reversal of 857128537 is 735821758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 484484121 + 372644416 = 22011^2 + 19304^2 .

It is a cyclic number.

It is not a de Polignac number, because 857128537 - 2¹¹ = 857126489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (857128567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428564268 + 428564269.

It is an arithmetic number, because the mean of its divisors is an integer number (428564269).

Almost surely, 2^857128537 is an apocalyptic number.

It is an amenable number.

857128537 is a deficient number, since it is larger than the sum of its proper divisors (1).

857128537 is an equidigital number, since it uses as much as digits as its factorization.

857128537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 46.

The square root of 857128537 is about 29276.7576244365. The cubic root of 857128537 is about 949.9089615438.

It can be divided in two parts, 85712 and 8537, that added together give a palindrome (94249).

The spelling of 857128537 in words is "eight hundred fifty-seven million, one hundred twenty-eight thousand, five hundred thirty-seven".