505320553 has 4 divisors (see below), whose sum is σ = 521621248. Its totient is φ = 489019860.

The previous prime is 505320539. The next prime is 505320589. The reversal of 505320553 is 355023505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355023505 = 5 ⋅71004701.

It is a cyclic number.

It is not a de Polignac number, because 505320553 - 2⁵ = 505320521 is a prime.

It is a super-2 number, since 2×505320553² = 510697722568451618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505320533) 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, 8150301 + ... + 8150362.

It is an arithmetic number, because the mean of its divisors is an integer number (130405312).

Almost surely, 2^505320553 is an apocalyptic number.

It is an amenable number.

505320553 is a deficient number, since it is larger than the sum of its proper divisors (16300695).

505320553 is a wasteful number, since it uses less digits than its factorization.

505320553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16300694.

The product of its (nonzero) digits is 11250, while the sum is 28.

The square root of 505320553 is about 22479.3361334360. The cubic root of 505320553 is about 796.5058825011.

The spelling of 505320553 in words is "five hundred five million, three hundred twenty thousand, five hundred fifty-three".