7813238155 has 16 divisors (see below), whose sum is σ = 9420300000. Its totient is φ = 6221030400.

The previous prime is 7813238141. The next prime is 7813238179. The reversal of 7813238155 is 5518323187.

It is a de Polignac number, because none of the positive numbers 2^k-7813238155 is a prime.

It is a super-2 number, since 2×7813238155² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1677580 + ... + 1682230.

It is an arithmetic number, because the mean of its divisors is an integer number (588768750).

Almost surely, 2^7813238155 is an apocalyptic number.

7813238155 is a deficient number, since it is larger than the sum of its proper divisors (1607061845).

7813238155 is a wasteful number, since it uses less digits than its factorization.

7813238155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6174.

The product of its digits is 201600, while the sum is 43.

The square root of 7813238155 is about 88392.5231849391. The cubic root of 7813238155 is about 1984.3138062201.

The spelling of 7813238155 in words is "seven billion, eight hundred thirteen million, two hundred thirty-eight thousand, one hundred fifty-five".