505720511 has 4 divisors (see below), whose sum is σ = 532337400. Its totient is φ = 479103624.

The previous prime is 505720507. The next prime is 505720519. The reversal of 505720511 is 115027505.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 505720511 - 2² = 505720507 is a prime.

It is a super-2 number, since 2×505720511² = 511506470492202242, which 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 (505720519) 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, 13308416 + ... + 13308453.

It is an arithmetic number, because the mean of its divisors is an integer number (133084350).

Almost surely, 2^505720511 is an apocalyptic number.

505720511 is a deficient number, since it is larger than the sum of its proper divisors (26616889).

505720511 is a wasteful number, since it uses less digits than its factorization.

505720511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26616888.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 505720511 is about 22488.2304995302. The cubic root of 505720511 is about 796.7159701946.

The spelling of 505720511 in words is "five hundred five million, seven hundred twenty thousand, five hundred eleven".