729109170961 has 2 divisors, whose sum is σ = 729109170962. Its totient is φ = 729109170960.

The previous prime is 729109170943. The next prime is 729109170991. The reversal of 729109170961 is 169071901927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 726543140625 + 2566030336 = 852375^2 + 50656^2 .

It is a cyclic number.

It is not a de Polignac number, because 729109170961 - 2¹¹ = 729109168913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 729109170899 and 729109170908.

It is not a weakly prime, because it can be changed into another prime (729109170931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364554585480 + 364554585481.

It is an arithmetic number, because the mean of its divisors is an integer number (364554585481).

Almost surely, 2^729109170961 is an apocalyptic number.

It is an amenable number.

729109170961 is a deficient number, since it is larger than the sum of its proper divisors (1).

729109170961 is an equidigital number, since it uses as much as digits as its factorization.

729109170961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652, while the sum is 52.

The spelling of 729109170961 in words is "seven hundred twenty-nine billion, one hundred nine million, one hundred seventy thousand, nine hundred sixty-one".