1818385351 has 4 divisors (see below), whose sum is σ = 1831467400. Its totient is φ = 1805303304.

The previous prime is 1818385237. The next prime is 1818385391. The reversal of 1818385351 is 1535838181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1535838181 = 43 ⋅35717167.

It is a cyclic number.

It is not a de Polignac number, because 1818385351 - 2⁷ = 1818385223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1818385298 and 1818385307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818385391) 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 in 3 ways as a sum of consecutive naturals, for example, 6540816 + ... + 6541093.

It is an arithmetic number, because the mean of its divisors is an integer number (457866850).

Almost surely, 2^1818385351 is an apocalyptic number.

1818385351 is a deficient number, since it is larger than the sum of its proper divisors (13082049).

1818385351 is a wasteful number, since it uses less digits than its factorization.

1818385351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13082048.

The product of its digits is 115200, while the sum is 43.

The square root of 1818385351 is about 42642.5298381792. The cubic root of 1818385351 is about 1220.5679857727.

The spelling of 1818385351 in words is "one billion, eight hundred eighteen million, three hundred eighty-five thousand, three hundred fifty-one".