511020042311 has 4 divisors (see below), whose sum is σ = 523483945824. Its totient is φ = 498556138800.

The previous prime is 511020042131. The next prime is 511020042329. The reversal of 511020042311 is 113240020115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511020042311 is a prime.

It is a super-2 number, since 2×511020042311² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511020042391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6231951695 + ... + 6231951776.

It is an arithmetic number, because the mean of its divisors is an integer number (130870986456).

Almost surely, 2^511020042311 is an apocalyptic number.

511020042311 is a deficient number, since it is larger than the sum of its proper divisors (12463903513).

511020042311 is a wasteful number, since it uses less digits than its factorization.

511020042311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12463903512.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 511020042311 its reverse (113240020115), we get a palindrome (624260062426).

The spelling of 511020042311 in words is "five hundred eleven billion, twenty million, forty-two thousand, three hundred eleven".