1321420637 has 2 divisors, whose sum is σ = 1321420638. Its totient is φ = 1321420636.

The previous prime is 1321420631. The next prime is 1321420657. The reversal of 1321420637 is 7360241231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188456676 + 132963961 = 34474^2 + 11531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321420637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321420631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660710318 + 660710319.

It is an arithmetic number, because the mean of its divisors is an integer number (660710319).

Almost surely, 2^1321420637 is an apocalyptic number.

It is an amenable number.

1321420637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321420637 is an equidigital number, since it uses as much as digits as its factorization.

1321420637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 1321420637 is about 36351.3498648950. The cubic root of 1321420637 is about 1097.3547006618.

Adding to 1321420637 its reverse (7360241231), we get a palindrome (8681661868).

The spelling of 1321420637 in words is "one billion, three hundred twenty-one million, four hundred twenty thousand, six hundred thirty-seven".