1351831321 has 2 divisors, whose sum is σ = 1351831322. Its totient is φ = 1351831320.

The previous prime is 1351831319. The next prime is 1351831333. The reversal of 1351831321 is 1231381531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912342025 + 439489296 = 30205^2 + 20964^2 .

It is an emirp because it is prime and its reverse (1231381531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1351831321 - 2¹ = 1351831319 is a prime.

Together with 1351831319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1351831321.

It is not a weakly prime, because it can be changed into another prime (1351841321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675915660 + 675915661.

It is an arithmetic number, because the mean of its divisors is an integer number (675915661).

Almost surely, 2^1351831321 is an apocalyptic number.

It is an amenable number.

1351831321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351831321 is an equidigital number, since it uses as much as digits as its factorization.

1351831321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 1351831321 is about 36767.2588181387. The cubic root of 1351831321 is about 1105.7089752114.

The spelling of 1351831321 in words is "one billion, three hundred fifty-one million, eight hundred thirty-one thousand, three hundred twenty-one".