618391813 has 16 divisors (see below), whose sum is σ = 727888896. Its totient is φ = 519909120.

The previous prime is 618391799. The next prime is 618391817. The reversal of 618391813 is 318193816.

618391813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 618391813 - 2²¹ = 616294661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618391817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38281 + ... + 51982.

It is an arithmetic number, because the mean of its divisors is an integer number (45493056).

Almost surely, 2^618391813 is an apocalyptic number.

It is an amenable number.

618391813 is a deficient number, since it is larger than the sum of its proper divisors (109497083).

618391813 is a wasteful number, since it uses less digits than its factorization.

618391813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90324.

The product of its digits is 31104, while the sum is 40.

The square root of 618391813 is about 24867.4850557912. The cubic root of 618391813 is about 851.9639996875.

The spelling of 618391813 in words is "six hundred eighteen million, three hundred ninety-one thousand, eight hundred thirteen".