1808864149 has 2 divisors, whose sum is σ = 1808864150. Its totient is φ = 1808864148.

The previous prime is 1808864147. The next prime is 1808864173. The reversal of 1808864149 is 9414688081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1589616900 + 219247249 = 39870^2 + 14807^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808864149 - 2¹ = 1808864147 is a prime.

Together with 1808864147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808864147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904432074 + 904432075.

It is an arithmetic number, because the mean of its divisors is an integer number (904432075).

Almost surely, 2^1808864149 is an apocalyptic number.

It is an amenable number.

1808864149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808864149 is an equidigital number, since it uses as much as digits as its factorization.

1808864149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 49.

The square root of 1808864149 is about 42530.7435745015. The cubic root of 1808864149 is about 1218.4339282441.

The spelling of 1808864149 in words is "one billion, eight hundred eight million, eight hundred sixty-four thousand, one hundred forty-nine".