1321322137 has 2 divisors, whose sum is σ = 1321322138. Its totient is φ = 1321322136.

The previous prime is 1321322077. The next prime is 1321322183. The reversal of 1321322137 is 7312231231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1147583376 + 173738761 = 33876^2 + 13181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321322137 - 2¹¹ = 1321320089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321322237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660661068 + 660661069.

It is an arithmetic number, because the mean of its divisors is an integer number (660661069).

Almost surely, 2^1321322137 is an apocalyptic number.

It is an amenable number.

1321322137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321322137 is an equidigital number, since it uses as much as digits as its factorization.

1321322137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 1321322137 is about 36349.9950068772. The cubic root of 1321322137 is about 1097.3274340164.

Adding to 1321322137 its reverse (7312231231), we get a palindrome (8633553368).

The spelling of 1321322137 in words is "one billion, three hundred twenty-one million, three hundred twenty-two thousand, one hundred thirty-seven".