818642137 has 2 divisors, whose sum is σ = 818642138. Its totient is φ = 818642136.

The previous prime is 818642119. The next prime is 818642171. The reversal of 818642137 is 731246818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529506121 + 289136016 = 23011^2 + 17004^2 .

It is a cyclic number.

It is not a de Polignac number, because 818642137 - 2¹¹ = 818640089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 818642137.

It is not a weakly prime, because it can be changed into another prime (818642107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409321068 + 409321069.

It is an arithmetic number, because the mean of its divisors is an integer number (409321069).

Almost surely, 2^818642137 is an apocalyptic number.

It is an amenable number.

818642137 is a deficient number, since it is larger than the sum of its proper divisors (1).

818642137 is an equidigital number, since it uses as much as digits as its factorization.

818642137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 818642137 is about 28611.9229867550. The cubic root of 818642137 is about 935.4732319935.

The spelling of 818642137 in words is "eight hundred eighteen million, six hundred forty-two thousand, one hundred thirty-seven".