613855 has 8 divisors (see below), whose sum is σ = 803664. Its totient is φ = 446400.

The previous prime is 613849. The next prime is 613861. The reversal of 613855 is 558316.

It is an interprime number because it is at equal distance from previous prime (613849) and next prime (613861).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 613855 - 2¹⁹ = 89567 is a prime.

It is a super-2 number, since 2×613855² = 753635922050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5526 + ... + 5635.

It is an arithmetic number, because the mean of its divisors is an integer number (100458).

2⁶¹³⁸⁵⁵ is an apocalyptic number.

613855 is a deficient number, since it is larger than the sum of its proper divisors (189809).

613855 is a wasteful number, since it uses less digits than its factorization.

613855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11177.

The product of its digits is 3600, while the sum is 28.

The square root of 613855 is about 783.4889916266. The cubic root of 613855 is about 84.9875414266.

It can be divided in two parts, 61 and 3855, that added together give a triangular number (3916 = T₈₈).

The spelling of 613855 in words is "six hundred thirteen thousand, eight hundred fifty-five".