1301261329 has 3 divisors (see below), whose sum is σ = 1301297403. Its totient is φ = 1301225256.

The previous prime is 1301261327. The next prime is 1301261389. The reversal of 1301261329 is 9231621031.

The square root of 1301261329 is 36073.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9231621031 = 89 ⋅103726079.

It can be written as a sum of positive squares in only one way, i.e., 1198198225 + 103063104 = 34615^2 + 10152^2 .

It is not a de Polignac number, because 1301261329 - 2¹ = 1301261327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1301261297 and 1301261306.

It is not an unprimeable number, because it can be changed into a prime (1301261323) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18037 + ... + 54109.

It is an arithmetic number, because the mean of its divisors is an integer number (433765801).

Almost surely, 2^1301261329 is an apocalyptic number.

1301261329 is the 36073-rd square number.

1301261329 is the 18037-th centered octagonal number.

It is an amenable number.

1301261329 is a deficient number, since it is larger than the sum of its proper divisors (36074).

1301261329 is an frugal number, since it uses more digits than its factorization.

1301261329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72146 (or 36073 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The cubic root of 1301261329 is about 1091.7457447316.

The spelling of 1301261329 in words is "one billion, three hundred one million, two hundred sixty-one thousand, three hundred twenty-nine".