7951391556 has 48 divisors (see below), whose sum is σ = 18933936000. Its totient is φ = 2596568832.

The previous prime is 7951391551. The next prime is 7951391563. The reversal of 7951391556 is 6551931597.

It is a super-2 number, since 2×7951391556² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7951391499 and 7951391508.

It is not an unprimeable number, because it can be changed into a prime (7951391551) 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, 100065 + ... + 160983.

It is an arithmetic number, because the mean of its divisors is an integer number (394457000).

Almost surely, 2^7951391556 is an apocalyptic number.

It is an amenable number.

7951391556 is an abundant number, since it is smaller than the sum of its proper divisors (10982544444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7951391556 is a wasteful number, since it uses less digits than its factorization.

7951391556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61148 (or 61146 counting only the distinct ones).

The product of its digits is 1275750, while the sum is 51.

The square root of 7951391556 is about 89170.5756177451. The cubic root of 7951391556 is about 1995.9410644269.

The spelling of 7951391556 in words is "seven billion, nine hundred fifty-one million, three hundred ninety-one thousand, five hundred fifty-six".