5121978679 has 2 divisors, whose sum is σ = 5121978680. Its totient is φ = 5121978678.

The previous prime is 5121978607. The next prime is 5121978683. The reversal of 5121978679 is 9768791215.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5121978679 - 2⁷ = 5121978551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5121978179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560989339 + 2560989340.

It is an arithmetic number, because the mean of its divisors is an integer number (2560989340).

Almost surely, 2^5121978679 is an apocalyptic number.

5121978679 is a deficient number, since it is larger than the sum of its proper divisors (1).

5121978679 is an equidigital number, since it uses as much as digits as its factorization.

5121978679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 55.

The square root of 5121978679 is about 71568.0003842499. Note that the first 3 decimals coincide. The cubic root of 5121978679 is about 1723.7697512778.

Subtracting from 5121978679 its sum of digits (55), we obtain a square (5121978624 = 71568²).

The spelling of 5121978679 in words is "five billion, one hundred twenty-one million, nine hundred seventy-eight thousand, six hundred seventy-nine".