1618461797 has 2 divisors, whose sum is σ = 1618461798. Its totient is φ = 1618461796.

The previous prime is 1618461791. The next prime is 1618461809. The reversal of 1618461797 is 7971648161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1475635396 + 142826401 = 38414^2 + 11951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618461797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1618461791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809230898 + 809230899.

It is an arithmetic number, because the mean of its divisors is an integer number (809230899).

Almost surely, 2^1618461797 is an apocalyptic number.

It is an amenable number.

1618461797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618461797 is an equidigital number, since it uses as much as digits as its factorization.

1618461797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 50.

The square root of 1618461797 is about 40230.1105765321. The cubic root of 1618461797 is about 1174.0884548142.

The spelling of 1618461797 in words is "one billion, six hundred eighteen million, four hundred sixty-one thousand, seven hundred ninety-seven".