7851115947 has 6 divisors (see below), whose sum is σ = 10468359228. Its totient is φ = 5233974984.

The previous prime is 7851115927. The next prime is 7851115963. The reversal of 7851115947 is 7495111587.

It is not a de Polignac number, because 7851115947 - 2¹⁰ = 7851114923 is a prime.

It is a super-2 number, since 2×7851115947² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7851115896 and 7851115905.

It is not an unprimeable number, because it can be changed into a prime (7851115927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127893 + ... + 179049.

It is an arithmetic number, because the mean of its divisors is an integer number (1744726538).

Almost surely, 2^7851115947 is an apocalyptic number.

7851115947 is a deficient number, since it is larger than the sum of its proper divisors (2617243281).

7851115947 is an frugal number, since it uses more digits than its factorization.

7851115947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102317 (or 51160 counting only the distinct ones).

The product of its digits is 352800, while the sum is 48.

The square root of 7851115947 is about 88606.5231628011. The cubic root of 7851115947 is about 1987.5152229205.

Multiplying 7851115947 by its sum of digits (48), we get a square (376853565456 = 613884²).

The spelling of 7851115947 in words is "seven billion, eight hundred fifty-one million, one hundred fifteen thousand, nine hundred forty-seven".