1491271 has 2 divisors, whose sum is σ = 1491272. Its totient is φ = 1491270.

The previous prime is 1491247. The next prime is 1491299. The reversal of 1491271 is 1721941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1491271 - 2⁵ = 1491239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745635 + 745636.

It is an arithmetic number, because the mean of its divisors is an integer number (745636).

2^1491271 is an apocalyptic number.

1491271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491271 is an equidigital number, since it uses as much as digits as its factorization.

1491271 is an evil number, because the sum of its binary digits is even.

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

The square root of 1491271 is about 1221.1760724810. The cubic root of 1491271 is about 114.2489430065.

The spelling of 1491271 in words is "one million, four hundred ninety-one thousand, two hundred seventy-one".