7871181631 has 2 divisors, whose sum is σ = 7871181632. Its totient is φ = 7871181630.

The previous prime is 7871181629. The next prime is 7871181671. The reversal of 7871181631 is 1361811787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7871181631 - 2¹ = 7871181629 is a prime.

It is a super-2 number, since 2×7871181631² (a number of 21 digits) contains 22 as substring.

Together with 7871181629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7871181671) by changing a digit.

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 as a sum of consecutive naturals, namely, 3935590815 + 3935590816.

It is an arithmetic number, because the mean of its divisors is an integer number (3935590816).

Almost surely, 2^7871181631 is an apocalyptic number.

7871181631 is a deficient number, since it is larger than the sum of its proper divisors (1).

7871181631 is an equidigital number, since it uses as much as digits as its factorization.

7871181631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 43.

The square root of 7871181631 is about 88719.6800659245. The cubic root of 7871181631 is about 1989.2069962235.

The spelling of 7871181631 in words is "seven billion, eight hundred seventy-one million, one hundred eighty-one thousand, six hundred thirty-one".