1491271705 has 32 divisors (see below), whose sum is σ = 2362348800. Its totient is φ = 874936320.

The previous prime is 1491271693. The next prime is 1491271741. The reversal of 1491271705 is 5071721941.

It is not a de Polignac number, because 1491271705 - 2⁷ = 1491271577 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 107380 + ... + 120469.

It is an arithmetic number, because the mean of its divisors is an integer number (73823400).

Almost surely, 2^1491271705 is an apocalyptic number.

It is an amenable number.

1491271705 is a deficient number, since it is larger than the sum of its proper divisors (871077095).

1491271705 is a wasteful number, since it uses less digits than its factorization.

1491271705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227889.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 1491271705 is about 38616.9872594950. The cubic root of 1491271705 is about 1142.4896101024.

The spelling of 1491271705 in words is "one billion, four hundred ninety-one million, two hundred seventy-one thousand, seven hundred five".