1808441797 has 2 divisors, whose sum is σ = 1808441798. Its totient is φ = 1808441796.

The previous prime is 1808441749. The next prime is 1808441809. The reversal of 1808441797 is 7971448081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1270851201 + 537590596 = 35649^2 + 23186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1808441797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1808441797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808441737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904220898 + 904220899.

It is an arithmetic number, because the mean of its divisors is an integer number (904220899).

Almost surely, 2^1808441797 is an apocalyptic number.

It is an amenable number.

1808441797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808441797 is an equidigital number, since it uses as much as digits as its factorization.

1808441797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 1808441797 is about 42525.7780293318. The cubic root of 1808441797 is about 1218.3390900802.

The spelling of 1808441797 in words is "one billion, eight hundred eight million, four hundred forty-one thousand, seven hundred ninety-seven".