618402081 has 48 divisors (see below), whose sum is σ = 1001572992. Its totient is φ = 337328640.

The previous prime is 618402067. The next prime is 618402089. The reversal of 618402081 is 180204816.

It is not a de Polignac number, because 618402081 - 2¹¹ = 618400033 is a prime.

It is a super-2 number, since 2×618402081² = 764842267570261122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618402089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139755 + ... + 144111.

It is an arithmetic number, because the mean of its divisors is an integer number (20866104).

Almost surely, 2^618402081 is an apocalyptic number.

It is an amenable number.

618402081 is a deficient number, since it is larger than the sum of its proper divisors (383170911).

618402081 is a wasteful number, since it uses less digits than its factorization.

618402081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422 (or 4411 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 618402081 is about 24867.6915092656. The cubic root of 618402081 is about 851.9687151002.

Adding to 618402081 its reverse (180204816), we get a palindrome (798606897).

The spelling of 618402081 in words is "six hundred eighteen million, four hundred two thousand, eighty-one".