6947845631 has 4 divisors (see below), whose sum is σ = 7078937112. Its totient is φ = 6816754152.

The previous prime is 6947845613. The next prime is 6947845657. The reversal of 6947845631 is 1365487496.

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-6947845631 is a prime.

It is a super-2 number, since 2×6947845631² = 96545117824411576322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 131091427 = 6947845631 / (6 + 9 + 4 + 7 + 8 + 4 + 5 + 6 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6947845601) 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, 65545661 + ... + 65545766.

It is an arithmetic number, because the mean of its divisors is an integer number (1769734278).

Almost surely, 2^6947845631 is an apocalyptic number.

6947845631 is a deficient number, since it is larger than the sum of its proper divisors (131091481).

6947845631 is a wasteful number, since it uses less digits than its factorization.

6947845631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131091480.

The product of its digits is 4354560, while the sum is 53.

The square root of 6947845631 is about 83353.7379545753. The cubic root of 6947845631 is about 1908.1684910216.

The spelling of 6947845631 in words is "six billion, nine hundred forty-seven million, eight hundred forty-five thousand, six hundred thirty-one".