7839978131 has 2 divisors, whose sum is σ = 7839978132. Its totient is φ = 7839978130.

The previous prime is 7839978101. The next prime is 7839978143. The reversal of 7839978131 is 1318799387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7839978131 - 2³⁰ = 6766236307 is a prime.

It is a super-2 number, since 2×7839978131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7839978101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3919989065 + 3919989066.

It is an arithmetic number, because the mean of its divisors is an integer number (3919989066).

Almost surely, 2^7839978131 is an apocalyptic number.

7839978131 is a deficient number, since it is larger than the sum of its proper divisors (1).

7839978131 is an equidigital number, since it uses as much as digits as its factorization.

7839978131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 56.

The square root of 7839978131 is about 88543.6509920389. The cubic root of 7839978131 is about 1986.5749296289.

The spelling of 7839978131 in words is "seven billion, eight hundred thirty-nine million, nine hundred seventy-eight thousand, one hundred thirty-one".