5161421729 has 2 divisors, whose sum is σ = 5161421730. Its totient is φ = 5161421728.

The previous prime is 5161421693. The next prime is 5161421779. The reversal of 5161421729 is 9271241615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5033618704 + 127803025 = 70948^2 + 11305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5161421729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5161421692 and 5161421701.

It is not a weakly prime, because it can be changed into another prime (5161421779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2580710864 + 2580710865.

It is an arithmetic number, because the mean of its divisors is an integer number (2580710865).

Almost surely, 2^5161421729 is an apocalyptic number.

It is an amenable number.

5161421729 is a deficient number, since it is larger than the sum of its proper divisors (1).

5161421729 is an equidigital number, since it uses as much as digits as its factorization.

5161421729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 5161421729 is about 71843.0353548623. The cubic root of 5161421729 is about 1728.1832118530.

The spelling of 5161421729 in words is "five billion, one hundred sixty-one million, four hundred twenty-one thousand, seven hundred twenty-nine".