1281381 has 8 divisors (see below), whose sum is σ = 1740960. Its totient is φ = 838032.

The previous prime is 1281367. The next prime is 1281383. The reversal of 1281381 is 1831821.

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

It is not a de Polignac number, because 1281381 - 2⁵ = 1281349 is a prime.

It is a super-2 number, since 2×1281381² = 3283874534322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3871 + ... + 4188.

It is an arithmetic number, because the mean of its divisors is an integer number (217620).

2^1281381 is an apocalyptic number.

It is an amenable number.

1281381 is a deficient number, since it is larger than the sum of its proper divisors (459579).

1281381 is an equidigital number, since it uses as much as digits as its factorization.

1281381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8115.

The product of its digits is 384, while the sum is 24.

The square root of 1281381 is about 1131.9810069078. The cubic root of 1281381 is about 108.6157386576.

The spelling of 1281381 in words is "one million, two hundred eighty-one thousand, three hundred eighty-one".