Search a number
553 = 779

553 has 4 divisors (see below), whose sum is σ = 640. Its totient is φ = 468.

The previous prime is 547. The next prime is 557. The reversal of 553 is 355.

553 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

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: 355 = 571.

It is a cyclic number.

It is not a de Polignac number, because 553 - 25 = 521 is a prime.

It is the 24-th Hogben number.

It is a Duffinian number.

553 is a lucky number.

It is a plaindrome in base 13, base 15 and base 16.

It is a nialpdrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 553.

It is not an unprimeable number, because it can be changed into a prime (557) by changing a digit.

It is a nontrivial repunit in base 23.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33 + ... + 46.

It is an arithmetic number, because the mean of its divisors is an integer number (160).

It is an amenable number.

553 is a deficient number, since it is larger than the sum of its proper divisors (87).

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

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

The sum of its prime factors is 86.

The product of its digits is 75, while the sum is 13.

The square root of 553 is about 23.5159520326. The cubic root of 553 is about 8.2080824532.

The spelling of 553 in words is "five hundred fifty-three", and thus it is an aban number and an oban number.

Divisors: 1 7 79 553