511011423991 has 2 divisors, whose sum is σ = 511011423992. Its totient is φ = 511011423990.

The previous prime is 511011423971. The next prime is 511011424013. The reversal of 511011423991 is 199324110115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 511011423991 - 2⁷ = 511011423863 is a prime.

It is a super-2 number, since 2×511011423991² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 511011423991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511011423971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255505711995 + 255505711996.

It is an arithmetic number, because the mean of its divisors is an integer number (255505711996).

Almost surely, 2^511011423991 is an apocalyptic number.

511011423991 is a deficient number, since it is larger than the sum of its proper divisors (1).

511011423991 is an equidigital number, since it uses as much as digits as its factorization.

511011423991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 37.

The spelling of 511011423991 in words is "five hundred eleven billion, eleven million, four hundred twenty-three thousand, nine hundred ninety-one".