1271145 has 16 divisors (see below), whose sum is σ = 2060352. Its totient is φ = 669120.

The previous prime is 1271129. The next prime is 1271147. The reversal of 1271145 is 5411721.

It is a happy number.

It is not a de Polignac number, because 1271145 - 2⁴ = 1271129 is a prime.

It is a super-2 number, since 2×1271145² = 3231619222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1271147) 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 15 ways as a sum of consecutive naturals, for example, 735 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (128772).

2^1271145 is an apocalyptic number.

1271145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1271145 is a deficient number, since it is larger than the sum of its proper divisors (789207).

1271145 is a wasteful number, since it uses less digits than its factorization.

1271145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112.

The product of its digits is 280, while the sum is 21.

The square root of 1271145 is about 1127.4506641091. The cubic root of 1271145 is about 108.3257483184.

Adding to 1271145 its reverse (5411721), we get a palindrome (6682866).

The spelling of 1271145 in words is "one million, two hundred seventy-one thousand, one hundred forty-five".