6971397517 has 4 divisors (see below), whose sum is σ = 7967311456. Its totient is φ = 5975483580.

The previous prime is 6971397491. The next prime is 6971397533. The reversal of 6971397517 is 7157931796.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6971397517 - 2¹⁹ = 6970873229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6971397557) 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, 497956959 + ... + 497956972.

It is an arithmetic number, because the mean of its divisors is an integer number (1991827864).

Almost surely, 2^6971397517 is an apocalyptic number.

It is an amenable number.

6971397517 is a deficient number, since it is larger than the sum of its proper divisors (995913939).

6971397517 is an equidigital number, since it uses as much as digits as its factorization.

6971397517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995913938.

The product of its digits is 2500470, while the sum is 55.

The square root of 6971397517 is about 83494.8951553327. The cubic root of 6971397517 is about 1910.3221697350.

The spelling of 6971397517 in words is "six billion, nine hundred seventy-one million, three hundred ninety-seven thousand, five hundred seventeen".