1381375321 has 4 divisors (see below), whose sum is σ = 1415067444. Its totient is φ = 1347683200.

The previous prime is 1381375313. The next prime is 1381375337. The reversal of 1381375321 is 1235731831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 458430921 + 922944400 = 21411^2 + 30380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381375321 - 2³ = 1381375313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381315321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16846000 + ... + 16846081.

It is an arithmetic number, because the mean of its divisors is an integer number (353766861).

Almost surely, 2^1381375321 is an apocalyptic number.

It is an amenable number.

1381375321 is a deficient number, since it is larger than the sum of its proper divisors (33692123).

1381375321 is an equidigital number, since it uses as much as digits as its factorization.

1381375321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33692122.

The product of its digits is 15120, while the sum is 34.

The square root of 1381375321 is about 37166.8578305996. The cubic root of 1381375321 is about 1113.7060125310.

The spelling of 1381375321 in words is "one billion, three hundred eighty-one million, three hundred seventy-five thousand, three hundred twenty-one".