7132815891 has 6 divisors (see below), whose sum is σ = 10302956300. Its totient is φ = 4755210588.

The previous prime is 7132815889. The next prime is 7132815929. The reversal of 7132815891 is 1985182317.

It is not a de Polignac number, because 7132815891 - 2¹ = 7132815889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7132815881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396267541 + ... + 396267558.

Almost surely, 2^7132815891 is an apocalyptic number.

7132815891 is a deficient number, since it is larger than the sum of its proper divisors (3170140409).

7132815891 is a wasteful number, since it uses less digits than its factorization.

7132815891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792535105 (or 792535102 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 7132815891 is about 84455.9997335891. Note that the first 3 decimals coincide. The cubic root of 7132815891 is about 1924.9539217396.

Adding to 7132815891 its sum of digits (45), we get a square (7132815936 = 84456²).

The spelling of 7132815891 in words is "seven billion, one hundred thirty-two million, eight hundred fifteen thousand, eight hundred ninety-one".