857376257 has 2 divisors, whose sum is σ = 857376258. Its totient is φ = 857376256.

The previous prime is 857376253. The next prime is 857376293. The reversal of 857376257 is 752673758.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785736961 + 71639296 = 28031^2 + 8464^2 .

It is a cyclic number.

It is not a de Polignac number, because 857376257 - 2² = 857376253 is a prime.

It is not a weakly prime, because it can be changed into another prime (857376253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428688128 + 428688129.

It is an arithmetic number, because the mean of its divisors is an integer number (428688129).

Almost surely, 2^857376257 is an apocalyptic number.

It is an amenable number.

857376257 is a deficient number, since it is larger than the sum of its proper divisors (1).

857376257 is an equidigital number, since it uses as much as digits as its factorization.

857376257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2469600, while the sum is 50.

The square root of 857376257 is about 29280.9879785502. The cubic root of 857376257 is about 950.0004642657. Note that the first 3 decimals are identical.

The spelling of 857376257 in words is "eight hundred fifty-seven million, three hundred seventy-six thousand, two hundred fifty-seven".