511787797 has 2 divisors, whose sum is σ = 511787798. Its totient is φ = 511787796.

The previous prime is 511787777. The next prime is 511787807. The reversal of 511787797 is 797787115.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466171281 + 45616516 = 21591^2 + 6754^2 .

It is a cyclic number.

It is not a de Polignac number, because 511787797 - 2¹¹ = 511785749 is a prime.

It is a super-2 number, since 2×511787797² = 523853498316226418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511787767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255893898 + 255893899.

It is an arithmetic number, because the mean of its divisors is an integer number (255893899).

Almost surely, 2^511787797 is an apocalyptic number.

It is an amenable number.

511787797 is a deficient number, since it is larger than the sum of its proper divisors (1).

511787797 is an equidigital number, since it uses as much as digits as its factorization.

511787797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864360, while the sum is 52.

The square root of 511787797 is about 22622.7274438782. The cubic root of 511787797 is about 799.8894623316.

The spelling of 511787797 in words is "five hundred eleven million, seven hundred eighty-seven thousand, seven hundred ninety-seven".