511968397 has 2 divisors, whose sum is σ = 511968398. Its totient is φ = 511968396.

The previous prime is 511968389. The next prime is 511968439. The reversal of 511968397 is 793869115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352350441 + 159617956 = 18771^2 + 12634^2 .

It is a cyclic number.

It is not a de Polignac number, because 511968397 - 2³ = 511968389 is a prime.

It is a super-2 number, since 2×511968397² = 524223279053499218, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 511968397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511968377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255984198 + 255984199.

It is an arithmetic number, because the mean of its divisors is an integer number (255984199).

Almost surely, 2^511968397 is an apocalyptic number.

It is an amenable number.

511968397 is a deficient number, since it is larger than the sum of its proper divisors (1).

511968397 is an equidigital number, since it uses as much as digits as its factorization.

511968397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 511968397 is about 22626.7186529554. The cubic root of 511968397 is about 799.9835397655.

The spelling of 511968397 in words is "five hundred eleven million, nine hundred sixty-eight thousand, three hundred ninety-seven".