1491771267 has 24 divisors (see below), whose sum is σ = 2607467616. Its totient is φ = 802296576.

The previous prime is 1491771173. The next prime is 1491771331. The reversal of 1491771267 is 7621771941.

It is not a de Polignac number, because 1491771267 - 2¹⁰ = 1491770243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491771067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 695368 + ... + 697509.

It is an arithmetic number, because the mean of its divisors is an integer number (108644484).

Almost surely, 2^1491771267 is an apocalyptic number.

1491771267 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1491771267 is a deficient number, since it is larger than the sum of its proper divisors (1115696349).

1491771267 is a wasteful number, since it uses less digits than its factorization.

1491771267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392907 (or 1392904 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 1491771267 is about 38623.4548817166. The cubic root of 1491771267 is about 1142.6171702854.

The spelling of 1491771267 in words is "one billion, four hundred ninety-one million, seven hundred seventy-one thousand, two hundred sixty-seven".