1642318813 has 4 divisors (see below), whose sum is σ = 1738925820. Its totient is φ = 1545711808.

The previous prime is 1642318787. The next prime is 1642318861. The reversal of 1642318813 is 3188132461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1149345604 + 492973209 = 33902^2 + 22203^2 .

It is not a de Polignac number, because 1642318813 - 2⁵ = 1642318781 is a prime.

It is a super-2 number, since 2×1642318813² = 5394422167067457938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642328813) 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 3 ways as a sum of consecutive naturals, for example, 48303478 + ... + 48303511.

It is an arithmetic number, because the mean of its divisors is an integer number (434731455).

Almost surely, 2^1642318813 is an apocalyptic number.

It is an amenable number.

1642318813 is a deficient number, since it is larger than the sum of its proper divisors (96607007).

1642318813 is an equidigital number, since it uses as much as digits as its factorization.

1642318813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96607006.

The product of its digits is 27648, while the sum is 37.

The square root of 1642318813 is about 40525.5328527584. The cubic root of 1642318813 is about 1179.8292420245.

The spelling of 1642318813 in words is "one billion, six hundred forty-two million, three hundred eighteen thousand, eight hundred thirteen".