1381281 has 16 divisors (see below), whose sum is σ = 2115840. Its totient is φ = 792720.

The previous prime is 1381279. The next prime is 1381291. The reversal of 1381281 is 1821831.

It is not a de Polignac number, because 1381281 - 2¹ = 1381279 is a prime.

It is a super-2 number, since 2×1381281² = 3815874401922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1381231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475 + ... + 1728.

It is an arithmetic number, because the mean of its divisors is an integer number (132240).

2^1381281 is an apocalyptic number.

1381281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1381281 is a deficient number, since it is larger than the sum of its proper divisors (734559).

1381281 is a wasteful number, since it uses less digits than its factorization.

1381281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236.

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

The square root of 1381281 is about 1175.2791157848. The cubic root of 1381281 is about 111.3680663819.

The spelling of 1381281 in words is "one million, three hundred eighty-one thousand, two hundred eighty-one".