7971431775 has 24 divisors (see below), whose sum is σ = 13182430080. Its totient is φ = 4250463840.

The previous prime is 7971431717. The next prime is 7971431821. The reversal of 7971431775 is 5771341797.

It is a happy number.

It is not a de Polignac number, because 7971431775 - 2⁶ = 7971431711 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 424536 + ... + 442914.

It is an arithmetic number, because the mean of its divisors is an integer number (549267920).

Almost surely, 2^7971431775 is an apocalyptic number.

7971431775 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

7971431775 is a deficient number, since it is larger than the sum of its proper divisors (5210998305).

7971431775 is a wasteful number, since it uses less digits than its factorization.

7971431775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24175 (or 24170 counting only the distinct ones).

The product of its digits is 1296540, while the sum is 51.

The square root of 7971431775 is about 89282.8750377137. The cubic root of 7971431775 is about 1997.6164751163.

The spelling of 7971431775 in words is "seven billion, nine hundred seventy-one million, four hundred thirty-one thousand, seven hundred seventy-five".