1311539071 has 4 divisors (see below), whose sum is σ = 1314810144. Its totient is φ = 1308268000.

The previous prime is 1311539023. The next prime is 1311539077. The reversal of 1311539071 is 1709351131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311539071 - 2²³ = 1303150463 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311539077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634935 + ... + 1635736.

It is an arithmetic number, because the mean of its divisors is an integer number (328702536).

Almost surely, 2^1311539071 is an apocalyptic number.

1311539071 is a deficient number, since it is larger than the sum of its proper divisors (3271073).

1311539071 is an equidigital number, since it uses as much as digits as its factorization.

1311539071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271072.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 1311539071 is about 36215.1773570143. The cubic root of 1311539071 is about 1094.6125192953.

The spelling of 1311539071 in words is "one billion, three hundred eleven million, five hundred thirty-nine thousand, seventy-one".