1311947571 has 16 divisors (see below), whose sum is σ = 1917341568. Its totient is φ = 791347200.

The previous prime is 1311947513. The next prime is 1311947603. The reversal of 1311947571 is 1757491131.

It is not a de Polignac number, because 1311947571 - 2¹⁹ = 1311423283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311947671) 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 15 ways as a sum of consecutive naturals, for example, 87246 + ... + 101171.

It is an arithmetic number, because the mean of its divisors is an integer number (119833848).

Almost surely, 2^1311947571 is an apocalyptic number.

1311947571 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1311947571 is a deficient number, since it is larger than the sum of its proper divisors (605393997).

1311947571 is a wasteful number, since it uses less digits than its factorization.

1311947571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188642.

The product of its digits is 26460, while the sum is 39.

The square root of 1311947571 is about 36220.8168185092. The cubic root of 1311947571 is about 1094.7261524072.

The spelling of 1311947571 in words is "one billion, three hundred eleven million, nine hundred forty-seven thousand, five hundred seventy-one".