618598081 has 4 divisors (see below), whose sum is σ = 618784852. Its totient is φ = 618411312.

The previous prime is 618598063. The next prime is 618598093. The reversal of 618598081 is 180895816.

618598081 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 can be written as a sum of positive squares in 2 ways, for example, as 392396481 + 226201600 = 19809^2 + 15040^2 .

It is a cyclic number.

It is not a de Polignac number, because 618598081 - 2¹⁷ = 618467009 is a prime.

It is a super-2 number, since 2×618598081² = 765327171633765122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618598061) 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, 88326 + ... + 95071.

It is an arithmetic number, because the mean of its divisors is an integer number (154696213).

Almost surely, 2^618598081 is an apocalyptic number.

It is an amenable number.

618598081 is a deficient number, since it is larger than the sum of its proper divisors (186771).

618598081 is a wasteful number, since it uses less digits than its factorization.

618598081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186770.

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 618598081 is about 24871.6320534057. The cubic root of 618598081 is about 852.0587149210.

The spelling of 618598081 in words is "six hundred eighteen million, five hundred ninety-eight thousand, eighty-one".