7871131785 has 16 divisors (see below), whose sum is σ = 13738703040. Its totient is φ = 3816306240.

The previous prime is 7871131777. The next prime is 7871131817. The reversal of 7871131785 is 5871311787.

It is not a de Polignac number, because 7871131785 - 2³ = 7871131777 is a prime.

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, 23851750 + ... + 23852079.

It is an arithmetic number, because the mean of its divisors is an integer number (858668940).

Almost surely, 2^7871131785 is an apocalyptic number.

It is an amenable number.

7871131785 is a deficient number, since it is larger than the sum of its proper divisors (5867571255).

7871131785 is a wasteful number, since it uses less digits than its factorization.

7871131785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47703848.

The product of its digits is 329280, while the sum is 48.

The square root of 7871131785 is about 88719.3991469735. The cubic root of 7871131785 is about 1989.2027971835.

It can be divided in two parts, 7871 and 131785, that added together give a triangular number (139656 = T₅₂₈).

The spelling of 7871131785 in words is "seven billion, eight hundred seventy-one million, one hundred thirty-one thousand, seven hundred eighty-five".