1618344997 has 2 divisors, whose sum is σ = 1618344998. Its totient is φ = 1618344996.

The previous prime is 1618344977. The next prime is 1618345009. The reversal of 1618344997 is 7994438161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 834400996 + 783944001 = 28886^2 + 27999^2 .

It is an emirp because it is prime and its reverse (7994438161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618344997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1618344977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809172498 + 809172499.

It is an arithmetic number, because the mean of its divisors is an integer number (809172499).

Almost surely, 2^1618344997 is an apocalyptic number.

It is an amenable number.

1618344997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618344997 is an equidigital number, since it uses as much as digits as its factorization.

1618344997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 1618344997 is about 40228.6589013355. The cubic root of 1618344997 is about 1174.0602105412.

The spelling of 1618344997 in words is "one billion, six hundred eighteen million, three hundred forty-four thousand, nine hundred ninety-seven".