7812181047 has 16 divisors (see below), whose sum is σ = 11627434368. Its totient is φ = 4624546080.

The previous prime is 7812181031. The next prime is 7812181057. The reversal of 7812181047 is 7401812187.

It is not a de Polignac number, because 7812181047 - 2⁴ = 7812181031 is a prime.

It is a super-2 number, since 2×7812181047² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7812180996 and 7812181014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7812181007) 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 15 ways as a sum of consecutive naturals, for example, 2751288 + ... + 2754125.

It is an arithmetic number, because the mean of its divisors is an integer number (726714648).

Almost surely, 2^7812181047 is an apocalyptic number.

7812181047 is a deficient number, since it is larger than the sum of its proper divisors (3815253321).

7812181047 is a wasteful number, since it uses less digits than its factorization.

7812181047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505470.

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 7812181047 is about 88386.5433592693. The cubic root of 7812181047 is about 1984.2243115886.

The spelling of 7812181047 in words is "seven billion, eight hundred twelve million, one hundred eighty-one thousand, forty-seven".