857445877 has 2 divisors, whose sum is σ = 857445878. Its totient is φ = 857445876.

The previous prime is 857445857. The next prime is 857445893. The reversal of 857445877 is 778544758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 532040356 + 325405521 = 23066^2 + 18039^2 .

It is a cyclic number.

It is not a de Polignac number, because 857445877 - 2⁷ = 857445749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857445817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428722938 + 428722939.

It is an arithmetic number, because the mean of its divisors is an integer number (428722939).

Almost surely, 2^857445877 is an apocalyptic number.

It is an amenable number.

857445877 is a deficient number, since it is larger than the sum of its proper divisors (1).

857445877 is an equidigital number, since it uses as much as digits as its factorization.

857445877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8780800, while the sum is 55.

The square root of 857445877 is about 29282.1767804240. The cubic root of 857445877 is about 950.0261773027.

The spelling of 857445877 in words is "eight hundred fifty-seven million, four hundred forty-five thousand, eight hundred seventy-seven".