618937321 has 2 divisors, whose sum is σ = 618937322. Its totient is φ = 618937320.

The previous prime is 618937301. The next prime is 618937381. The reversal of 618937321 is 123739816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614792025 + 4145296 = 24795^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 618937321 - 2²⁷ = 484719593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (618937301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309468660 + 309468661.

It is an arithmetic number, because the mean of its divisors is an integer number (309468661).

Almost surely, 2^618937321 is an apocalyptic number.

It is an amenable number.

618937321 is a deficient number, since it is larger than the sum of its proper divisors (1).

618937321 is an equidigital number, since it uses as much as digits as its factorization.

618937321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 618937321 is about 24878.4509365033. The cubic root of 618937321 is about 852.2144431634.

The spelling of 618937321 in words is "six hundred eighteen million, nine hundred thirty-seven thousand, three hundred twenty-one".