618551 has 4 divisors (see below), whose sum is σ = 620400. Its totient is φ = 616704.

The previous prime is 618547. The next prime is 618559. The reversal of 618551 is 155816.

618551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 618551 - 2² = 618547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 618551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618559) 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, 266 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (155100).

2⁶¹⁸⁵⁵¹ is an apocalyptic number.

618551 is a deficient number, since it is larger than the sum of its proper divisors (1849).

618551 is a wasteful number, since it uses less digits than its factorization.

618551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848.

The product of its digits is 1200, while the sum is 26.

The square root of 618551 is about 786.4801332519. The cubic root of 618551 is about 85.2037097873.

The spelling of 618551 in words is "six hundred eighteen thousand, five hundred fifty-one".