857647523 has 2 divisors, whose sum is σ = 857647524. Its totient is φ = 857647522.

The previous prime is 857647489. The next prime is 857647547. The reversal of 857647523 is 325746758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857647523 - 2⁸ = 857647267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (857647573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428823761 + 428823762.

It is an arithmetic number, because the mean of its divisors is an integer number (428823762).

Almost surely, 2^857647523 is an apocalyptic number.

857647523 is a deficient number, since it is larger than the sum of its proper divisors (1).

857647523 is an equidigital number, since it uses as much as digits as its factorization.

857647523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1411200, while the sum is 47.

The square root of 857647523 is about 29285.6197305094. The cubic root of 857647523 is about 950.1006441849.

The spelling of 857647523 in words is "eight hundred fifty-seven million, six hundred forty-seven thousand, five hundred twenty-three".