1802816549 has 2 divisors, whose sum is σ = 1802816550. Its totient is φ = 1802816548.

The previous prime is 1802816531. The next prime is 1802816591. The reversal of 1802816549 is 9456182081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1773925924 + 28890625 = 42118^2 + 5375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1802816549 - 2⁸ = 1802816293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1802816599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 901408274 + 901408275.

It is an arithmetic number, because the mean of its divisors is an integer number (901408275).

Almost surely, 2^1802816549 is an apocalyptic number.

It is an amenable number.

1802816549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1802816549 is an equidigital number, since it uses as much as digits as its factorization.

1802816549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 1802816549 is about 42459.5872448143. The cubic root of 1802816549 is about 1217.0745432836.

The spelling of 1802816549 in words is "one billion, eight hundred two million, eight hundred sixteen thousand, five hundred forty-nine".