618311081 has 2 divisors, whose sum is σ = 618311082. Its totient is φ = 618311080.

The previous prime is 618311011. The next prime is 618311137. The reversal of 618311081 is 180113816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416813056 + 201498025 = 20416^2 + 14195^2 .

It is a cyclic number.

It is not a de Polignac number, because 618311081 - 2¹⁰ = 618310057 is a prime.

It is a super-3 number, since 3×618311081³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (618311011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309155540 + 309155541.

It is an arithmetic number, because the mean of its divisors is an integer number (309155541).

Almost surely, 2^618311081 is an apocalyptic number.

It is an amenable number.

618311081 is a deficient number, since it is larger than the sum of its proper divisors (1).

618311081 is an equidigital number, since it uses as much as digits as its factorization.

618311081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 618311081 is about 24865.8617586441. The cubic root of 618311081 is about 851.9269230048.

Adding to 618311081 its reverse (180113816), we get a palindrome (798424897).

The spelling of 618311081 in words is "six hundred eighteen million, three hundred eleven thousand, eighty-one".