618997 has 2 divisors, whose sum is σ = 618998. Its totient is φ = 618996.

The previous prime is 618991. The next prime is 619007. The reversal of 618997 is 799816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 463761 + 155236 = 681^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 618997 - 2⁷ = 618869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309498 + 309499.

It is an arithmetic number, because the mean of its divisors is an integer number (309499).

2⁶¹⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

618997 is a deficient number, since it is larger than the sum of its proper divisors (1).

618997 is an equidigital number, since it uses as much as digits as its factorization.

618997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 618997 is about 786.7636239685. The cubic root of 618997 is about 85.2241832943.

The spelling of 618997 in words is "six hundred eighteen thousand, nine hundred ninety-seven".