1918290817 has 2 divisors, whose sum is σ = 1918290818. Its totient is φ = 1918290816.

The previous prime is 1918290809. The next prime is 1918290839. The reversal of 1918290817 is 7180928191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1917038656 + 1252161 = 43784^2 + 1119^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918290817 - 2³ = 1918290809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1918290887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959145408 + 959145409.

It is an arithmetic number, because the mean of its divisors is an integer number (959145409).

Almost surely, 2^1918290817 is an apocalyptic number.

It is an amenable number.

1918290817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918290817 is an equidigital number, since it uses as much as digits as its factorization.

1918290817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 1918290817 is about 43798.2969646081. The cubic root of 1918290817 is about 1242.5240853222.

The spelling of 1918290817 in words is "one billion, nine hundred eighteen million, two hundred ninety thousand, eight hundred seventeen".