5121789709 has 2 divisors, whose sum is σ = 5121789710. Its totient is φ = 5121789708.

The previous prime is 5121789691. The next prime is 5121789721. The reversal of 5121789709 is 9079871215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3862249609 + 1259540100 = 62147^2 + 35490^2 .

It is a cyclic number.

It is not a de Polignac number, because 5121789709 - 2⁷ = 5121789581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5121789509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560894854 + 2560894855.

It is an arithmetic number, because the mean of its divisors is an integer number (2560894855).

Almost surely, 2^5121789709 is an apocalyptic number.

It is an amenable number.

5121789709 is a deficient number, since it is larger than the sum of its proper divisors (1).

5121789709 is an equidigital number, since it uses as much as digits as its factorization.

5121789709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 5121789709 is about 71566.6801591355. The cubic root of 5121789709 is about 1723.7485521282.

The spelling of 5121789709 in words is "five billion, one hundred twenty-one million, seven hundred eighty-nine thousand, seven hundred nine".