1261332073 has 2 divisors, whose sum is σ = 1261332074. Its totient is φ = 1261332072.

The previous prime is 1261332071. The next prime is 1261332173. The reversal of 1261332073 is 3702331621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 809004249 + 452327824 = 28443^2 + 21268^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261332073 - 2¹ = 1261332071 is a prime.

Together with 1261332071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1261332071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630666036 + 630666037.

It is an arithmetic number, because the mean of its divisors is an integer number (630666037).

Almost surely, 2^1261332073 is an apocalyptic number.

It is an amenable number.

1261332073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261332073 is an equidigital number, since it uses as much as digits as its factorization.

1261332073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 1261332073 is about 35515.2371947591. The cubic root of 1261332073 is about 1080.4627854906.

Adding to 1261332073 its reverse (3702331621), we get a palindrome (4963663694).

The spelling of 1261332073 in words is "one billion, two hundred sixty-one million, three hundred thirty-two thousand, seventy-three".