1491266571 has 32 divisors (see below), whose sum is σ = 2204858880. Its totient is φ = 891753984.

The previous prime is 1491266461. The next prime is 1491266593. The reversal of 1491266571 is 1756621941.

It is not a de Polignac number, because 1491266571 - 2¹⁹ = 1490742283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491266071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341520 + ... + 345858.

It is an arithmetic number, because the mean of its divisors is an integer number (68901840).

Almost surely, 2^1491266571 is an apocalyptic number.

1491266571 is a deficient number, since it is larger than the sum of its proper divisors (713592309).

1491266571 is a wasteful number, since it uses less digits than its factorization.

1491266571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675.

The product of its digits is 90720, while the sum is 42.

The square root of 1491266571 is about 38616.9207861010. The cubic root of 1491266571 is about 1142.4882990181.

The spelling of 1491266571 in words is "one billion, four hundred ninety-one million, two hundred sixty-six thousand, five hundred seventy-one".