6947509434391 has 4 divisors (see below), whose sum is σ = 7171622641984. Its totient is φ = 6723396226800.

The previous prime is 6947509434343. The next prime is 6947509434419. The reversal of 6947509434391 is 1934349057496.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6947509434391 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 (6947509434311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112056603750 + ... + 112056603811.

It is an arithmetic number, because the mean of its divisors is an integer number (1792905660496).

Almost surely, 2^{6947509434391} is an apocalyptic number.

6947509434391 is a deficient number, since it is larger than the sum of its proper divisors (224113207593).

6947509434391 is a wasteful number, since it uses less digits than its factorization.

6947509434391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224113207592.

The product of its (nonzero) digits is 88179840, while the sum is 64.

The spelling of 6947509434391 in words is "six trillion, nine hundred forty-seven billion, five hundred nine million, four hundred thirty-four thousand, three hundred ninety-one".