1491571 has 2 divisors, whose sum is σ = 1491572. Its totient is φ = 1491570.

The previous prime is 1491547. The next prime is 1491577. The reversal of 1491571 is 1751941.

It is a strong prime.

It is an emirp because it is prime and its reverse (1751941) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491571 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491577) 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 as a sum of consecutive naturals, namely, 745785 + 745786.

It is an arithmetic number, because the mean of its divisors is an integer number (745786).

2^1491571 is an apocalyptic number.

1491571 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491571 is an equidigital number, since it uses as much as digits as its factorization.

1491571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 1491571 is about 1221.2988987140. The cubic root of 1491571 is about 114.2566036719.

The spelling of 1491571 in words is "one million, four hundred ninety-one thousand, five hundred seventy-one".