818471257 has 2 divisors, whose sum is σ = 818471258. Its totient is φ = 818471256.

The previous prime is 818471201. The next prime is 818471287. The reversal of 818471257 is 752174818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816873561 + 1597696 = 28581^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 818471257 - 2²⁷ = 684253529 is a prime.

It is not a weakly prime, because it can be changed into another prime (818471287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409235628 + 409235629.

It is an arithmetic number, because the mean of its divisors is an integer number (409235629).

Almost surely, 2^818471257 is an apocalyptic number.

It is an amenable number.

818471257 is a deficient number, since it is larger than the sum of its proper divisors (1).

818471257 is an equidigital number, since it uses as much as digits as its factorization.

818471257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125440, while the sum is 43.

The square root of 818471257 is about 28608.9366632177. The cubic root of 818471257 is about 935.4081385164.

The spelling of 818471257 in words is "eight hundred eighteen million, four hundred seventy-one thousand, two hundred fifty-seven".