1321134109 has 2 divisors, whose sum is σ = 1321134110. Its totient is φ = 1321134108.

The previous prime is 1321134079. The next prime is 1321134151. The reversal of 1321134109 is 9014311231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279492900 + 41641209 = 35770^2 + 6453^2 .

It is an emirp because it is prime and its reverse (9014311231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321134109 - 2¹¹ = 1321132061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321174109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660567054 + 660567055.

It is an arithmetic number, because the mean of its divisors is an integer number (660567055).

Almost surely, 2^1321134109 is an apocalyptic number.

It is an amenable number.

1321134109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321134109 is an equidigital number, since it uses as much as digits as its factorization.

1321134109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1321134109 is about 36347.4085596209. The cubic root of 1321134109 is about 1097.2753805807.

The spelling of 1321134109 in words is "one billion, three hundred twenty-one million, one hundred thirty-four thousand, one hundred nine".