1375120321 has 4 divisors (see below), whose sum is σ = 1375247700. Its totient is φ = 1374992944.

The previous prime is 1375120309. The next prime is 1375120333. The reversal of 1375120321 is 1230215731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1230215731 = 61 ⋅20167471.

It is an interprime number because it is at equal distance from previous prime (1375120309) and next prime (1375120333).

It can be written as a sum of positive squares in 2 ways, for example, as 963233296 + 411887025 = 31036^2 + 20295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375120321 - 2¹⁹ = 1374596033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375120301) 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 in 3 ways as a sum of consecutive naturals, for example, 45826 + ... + 69643.

It is an arithmetic number, because the mean of its divisors is an integer number (343811925).

Almost surely, 2^1375120321 is an apocalyptic number.

It is an amenable number.

1375120321 is a deficient number, since it is larger than the sum of its proper divisors (127379).

1375120321 is a wasteful number, since it uses less digits than its factorization.

1375120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127378.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 1375120321 is about 37082.6148080202. The cubic root of 1375120321 is about 1112.0224796730.

The spelling of 1375120321 in words is "one billion, three hundred seventy-five million, one hundred twenty thousand, three hundred twenty-one".