1312381 has 8 divisors (see below), whose sum is σ = 1532160. Its totient is φ = 1100688.

The previous prime is 1312379. The next prime is 1312391. The reversal of 1312381 is 1832131.

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 1312381 - 2¹ = 1312379 is a prime.

It is a super-2 number, since 2×1312381² = 3444687778322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312301) 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, 1666 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (191520).

2^1312381 is an apocalyptic number.

It is an amenable number.

1312381 is a deficient number, since it is larger than the sum of its proper divisors (219779).

1312381 is an equidigital number, since it uses as much as digits as its factorization.

1312381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043.

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

The square root of 1312381 is about 1145.5919867038. The cubic root of 1312381 is about 109.4846694272.

The spelling of 1312381 in words is "one million, three hundred twelve thousand, three hundred eighty-one".