618641 has 4 divisors (see below), whose sum is σ = 633072. Its totient is φ = 604212.

The previous prime is 618637. The next prime is 618643. The reversal of 618641 is 146816.

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.

It is a cyclic number.

It is not a de Polignac number, because 618641 - 2² = 618637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 618641.

It is not an unprimeable number, because it can be changed into a prime (618643) 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, 7151 + ... + 7236.

It is an arithmetic number, because the mean of its divisors is an integer number (158268).

2⁶¹⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

618641 is a deficient number, since it is larger than the sum of its proper divisors (14431).

618641 is a wasteful number, since it uses less digits than its factorization.

618641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14430.

The product of its digits is 1152, while the sum is 26.

The square root of 618641 is about 786.5373481279. The cubic root of 618641 is about 85.2078420049.

The spelling of 618641 in words is "six hundred eighteen thousand, six hundred forty-one".