618523 has 4 divisors (see below), whose sum is σ = 620928. Its totient is φ = 616120.

The previous prime is 618521. The next prime is 618547. The reversal of 618523 is 325816.

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 618523 - 2¹ = 618521 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

618523 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (618521) 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, 763 + ... + 1348.

It is an arithmetic number, because the mean of its divisors is an integer number (155232).

2⁶¹⁸⁵²³ is an apocalyptic number.

618523 is a deficient number, since it is larger than the sum of its proper divisors (2405).

618523 is a wasteful number, since it uses less digits than its factorization.

618523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404.

The product of its digits is 1440, while the sum is 25.

The square root of 618523 is about 786.4623322194. The cubic root of 618523 is about 85.2024241267.

The spelling of 618523 in words is "six hundred eighteen thousand, five hundred twenty-three".