1321381 has 8 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 1265040.

The previous prime is 1321379. The next prime is 1321391. The reversal of 1321381 is 1831231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321381 - 2¹ = 1321379 is a prime.

It is a super-2 number, since 2×1321381² = 3492095494322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2376 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (172368).

2^1321381 is an apocalyptic number.

It is an amenable number.

1321381 is a deficient number, since it is larger than the sum of its proper divisors (57563).

1321381 is an equidigital number, since it uses as much as digits as its factorization.

1321381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

The product of its digits is 144, while the sum is 19.

The square root of 1321381 is about 1149.5133753028. The cubic root of 1321381 is about 109.7343728561.

The spelling of 1321381 in words is "one million, three hundred twenty-one thousand, three hundred eighty-one".