511261897 has 2 divisors, whose sum is σ = 511261898. Its totient is φ = 511261896.

The previous prime is 511261879. The next prime is 511261921. The reversal of 511261897 is 798162115.

It is a happy number.

Together with previous prime (511261879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431766841 + 79495056 = 20779^2 + 8916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511261897 is a prime.

It is a super-2 number, since 2×511261897² = 522777454648077218, which contains 22 as substring.

It is equal to p_26916835 and since 511261897 and 26916835 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (511261837) 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, 255630948 + 255630949.

It is an arithmetic number, because the mean of its divisors is an integer number (255630949).

Almost surely, 2^511261897 is an apocalyptic number.

It is an amenable number.

511261897 is a deficient number, since it is larger than the sum of its proper divisors (1).

511261897 is an equidigital number, since it uses as much as digits as its factorization.

511261897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 40.

The square root of 511261897 is about 22611.1011894600. The cubic root of 511261897 is about 799.6153864743.

The spelling of 511261897 in words is "five hundred eleven million, two hundred sixty-one thousand, eight hundred ninety-seven".