3931878871 has 2 divisors, whose sum is σ = 3931878872. Its totient is φ = 3931878870.

The previous prime is 3931878833. The next prime is 3931878913. The reversal of 3931878871 is 1788781393.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3931878871 - 2¹⁵ = 3931846103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3931879871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1965939435 + 1965939436.

It is an arithmetic number, because the mean of its divisors is an integer number (1965939436).

Almost surely, 2^3931878871 is an apocalyptic number.

3931878871 is a deficient number, since it is larger than the sum of its proper divisors (1).

3931878871 is an equidigital number, since it uses as much as digits as its factorization.

3931878871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 55.

The square root of 3931878871 is about 62704.6957651498. The cubic root of 3931878871 is about 1578.3381114551.

The spelling of 3931878871 in words is "three billion, nine hundred thirty-one million, eight hundred seventy-eight thousand, eight hundred seventy-one".