1817143949 has 2 divisors, whose sum is σ = 1817143950. Its totient is φ = 1817143948.

The previous prime is 1817143919. The next prime is 1817143961. The reversal of 1817143949 is 9493417181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1655676100 + 161467849 = 40690^2 + 12707^2 .

It is a cyclic number.

It is not a de Polignac number, because 1817143949 - 2⁸ = 1817143693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1817143919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908571974 + 908571975.

It is an arithmetic number, because the mean of its divisors is an integer number (908571975).

Almost surely, 2^1817143949 is an apocalyptic number.

It is an amenable number.

1817143949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1817143949 is an equidigital number, since it uses as much as digits as its factorization.

1817143949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 1817143949 is about 42627.9714389507. The cubic root of 1817143949 is about 1220.2901641183.

The spelling of 1817143949 in words is "one billion, eight hundred seventeen million, one hundred forty-three thousand, nine hundred forty-nine".