7131856316531 has 16 divisors (see below), whose sum is σ = 7369898042304. Its totient is φ = 6898208538624.

The previous prime is 7131856316461. The next prime is 7131856316537. The reversal of 7131856316531 is 1356136581317.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7131856316531 is a prime.

It is a super-2 number, since 2×7131856316531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7131856316531.

It is not an unprimeable number, because it can be changed into a prime (7131856316537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1377695 + ... + 4020168.

It is an arithmetic number, because the mean of its divisors is an integer number (460618627644).

Almost surely, 2^{7131856316531} is an apocalyptic number.

7131856316531 is a deficient number, since it is larger than the sum of its proper divisors (238041725773).

7131856316531 is a wasteful number, since it uses less digits than its factorization.

7131856316531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5398270.

The product of its digits is 1360800, while the sum is 50.

The spelling of 7131856316531 in words is "seven trillion, one hundred thirty-one billion, eight hundred fifty-six million, three hundred sixteen thousand, five hundred thirty-one".