1817979049 has 2 divisors, whose sum is σ = 1817979050. Its totient is φ = 1817979048.

The previous prime is 1817979043. The next prime is 1817979061. The reversal of 1817979049 is 9409797181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1465741225 + 352237824 = 38285^2 + 18768^2 .

It is a cyclic number.

It is not a de Polignac number, because 1817979049 - 2¹⁵ = 1817946281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1817979043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908989524 + 908989525.

It is an arithmetic number, because the mean of its divisors is an integer number (908989525).

Almost surely, 2^1817979049 is an apocalyptic number.

It is an amenable number.

1817979049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1817979049 is an equidigital number, since it uses as much as digits as its factorization.

1817979049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 55.

The square root of 1817979049 is about 42637.7655254119. The cubic root of 1817979049 is about 1220.4770706550.

The spelling of 1817979049 in words is "one billion, eight hundred seventeen million, nine hundred seventy-nine thousand, forty-nine".