1321538429 has 2 divisors, whose sum is σ = 1321538430. Its totient is φ = 1321538428.

The previous prime is 1321538389. The next prime is 1321538431. The reversal of 1321538429 is 9248351231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1265438329 + 56100100 = 35573^2 + 7490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321538429 is a prime.

Together with 1321538431, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321538392 and 1321538401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321538329) 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, 660769214 + 660769215.

It is an arithmetic number, because the mean of its divisors is an integer number (660769215).

Almost surely, 2^1321538429 is an apocalyptic number.

It is an amenable number.

1321538429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321538429 is an equidigital number, since it uses as much as digits as its factorization.

1321538429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 1321538429 is about 36352.9700162174. The cubic root of 1321538429 is about 1097.3873059153.

The spelling of 1321538429 in words is "one billion, three hundred twenty-one million, five hundred thirty-eight thousand, four hundred twenty-nine".