1816131613 has 8 divisors (see below), whose sum is σ = 1862562240. Its totient is φ = 1769802720.

The previous prime is 1816131599. The next prime is 1816131659. The reversal of 1816131613 is 3161316181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1816131613 - 2¹⁷ = 1816000541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816135613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11398 + ... + 61336.

It is an arithmetic number, because the mean of its divisors is an integer number (232820280).

Almost surely, 2^1816131613 is an apocalyptic number.

It is an amenable number.

1816131613 is a deficient number, since it is larger than the sum of its proper divisors (46430627).

1816131613 is an equidigital number, since it uses as much as digits as its factorization.

1816131613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50867.

The product of its digits is 2592, while the sum is 31.

The square root of 1816131613 is about 42616.0957033842. The cubic root of 1816131613 is about 1220.0635129973.

Adding to 1816131613 its reverse (3161316181), we get a palindrome (4977447794).

The spelling of 1816131613 in words is "one billion, eight hundred sixteen million, one hundred thirty-one thousand, six hundred thirteen".