6947779141 has 4 divisors (see below), whose sum is σ = 6947994892. Its totient is φ = 6947563392.

The previous prime is 6947779099. The next prime is 6947779151. The reversal of 6947779141 is 1419777496.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4498519041 + 2449260100 = 67071^2 + 49490^2 .

It is a cyclic number.

It is not a de Polignac number, because 6947779141 - 2¹¹ = 6947777093 is a prime.

It is a super-2 number, since 2×6947779141² = 96543269984229395762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6947779151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48780 + ... + 127573.

It is an arithmetic number, because the mean of its divisors is an integer number (1736998723).

Almost surely, 2^6947779141 is an apocalyptic number.

It is an amenable number.

6947779141 is a deficient number, since it is larger than the sum of its proper divisors (215751).

6947779141 is a wasteful number, since it uses less digits than its factorization.

6947779141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215750.

The product of its digits is 2667168, while the sum is 55.

The square root of 6947779141 is about 83353.3391112798. The cubic root of 6947779141 is about 1908.1624040255.

The spelling of 6947779141 in words is "six billion, nine hundred forty-seven million, seven hundred seventy-nine thousand, one hundred forty-one".