1291127 has 4 divisors (see below), whose sum is σ = 1298520. Its totient is φ = 1283736.

The previous prime is 1291117. The next prime is 1291139. The reversal of 1291127 is 7211921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1291127 - 2⁴ = 1291111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3428 + ... + 3785.

It is an arithmetic number, because the mean of its divisors is an integer number (324630).

2^1291127 is an apocalyptic number.

1291127 is a deficient number, since it is larger than the sum of its proper divisors (7393).

1291127 is an equidigital number, since it uses as much as digits as its factorization.

1291127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7392.

The product of its digits is 252, while the sum is 23.

The square root of 1291127 is about 1136.2776949320. The cubic root of 1291127 is about 108.8904153534.

The spelling of 1291127 in words is "one million, two hundred ninety-one thousand, one hundred twenty-seven".