1271381 has 4 divisors (see below), whose sum is σ = 1300992. Its totient is φ = 1241772.

The previous prime is 1271359. The next prime is 1271383. The reversal of 1271381 is 1831721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1831721 = 127 ⋅14423.

It is a cyclic number.

It is not a de Polignac number, because 1271381 - 2⁶ = 1271317 is a prime.

It is a super-2 number, since 2×1271381² = 3232819294322, 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 (1271383) 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 3 ways as a sum of consecutive naturals, for example, 14741 + ... + 14826.

It is an arithmetic number, because the mean of its divisors is an integer number (325248).

2^1271381 is an apocalyptic number.

It is an amenable number.

1271381 is a deficient number, since it is larger than the sum of its proper divisors (29611).

1271381 is an equidigital number, since it uses as much as digits as its factorization.

1271381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29610.

The product of its digits is 336, while the sum is 23.

The square root of 1271381 is about 1127.5553201506. Note that the first 3 decimals coincide. The cubic root of 1271381 is about 108.3324518008.

The spelling of 1271381 in words is "one million, two hundred seventy-one thousand, three hundred eighty-one".