1271491 has 8 divisors (see below), whose sum is σ = 1399104. Its totient is φ = 1148160.

The previous prime is 1271483. The next prime is 1271503. The reversal of 1271491 is 1941721.

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

It is not a de Polignac number, because 1271491 - 2³ = 1271483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271401) 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, 430 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (174888).

2^1271491 is an apocalyptic number.

1271491 is a deficient number, since it is larger than the sum of its proper divisors (127613).

1271491 is a wasteful number, since it uses less digits than its factorization.

1271491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141.

The product of its digits is 504, while the sum is 25.

The square root of 1271491 is about 1127.6040971901. The cubic root of 1271491 is about 108.3355760219.

The spelling of 1271491 in words is "one million, two hundred seventy-one thousand, four hundred ninety-one".