495857861 has 2 divisors, whose sum is σ = 495857862. Its totient is φ = 495857860.

The previous prime is 495857827. The next prime is 495857881. The reversal of 495857861 is 168758594.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450712900 + 45144961 = 21230^2 + 6719^2 .

It is a cyclic number.

It is not a de Polignac number, because 495857861 - 2²⁶ = 428748997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (495857881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247928930 + 247928931.

It is an arithmetic number, because the mean of its divisors is an integer number (247928931).

Almost surely, 2^495857861 is an apocalyptic number.

It is an amenable number.

495857861 is a deficient number, since it is larger than the sum of its proper divisors (1).

495857861 is an equidigital number, since it uses as much as digits as its factorization.

495857861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 53.

The square root of 495857861 is about 22267.8661079143. The cubic root of 495857861 is about 791.5027003631.

The spelling of 495857861 in words is "four hundred ninety-five million, eight hundred fifty-seven thousand, eight hundred sixty-one".