1321107637 has 2 divisors, whose sum is σ = 1321107638. Its totient is φ = 1321107636.

The previous prime is 1321107629. The next prime is 1321107653. The reversal of 1321107637 is 7367011231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756855121 + 564252516 = 27511^2 + 23754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321107637 - 2³ = 1321107629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321107599 and 1321107608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321107037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660553818 + 660553819.

It is an arithmetic number, because the mean of its divisors is an integer number (660553819).

Almost surely, 2^1321107637 is an apocalyptic number.

It is an amenable number.

1321107637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321107637 is an equidigital number, since it uses as much as digits as its factorization.

1321107637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 1321107637 is about 36347.0444052883. The cubic root of 1321107637 is about 1097.2680517089.

Adding to 1321107637 its reverse (7367011231), we get a palindrome (8688118868).

The spelling of 1321107637 in words is "one billion, three hundred twenty-one million, one hundred seven thousand, six hundred thirty-seven".