6943989257 has 4 divisors (see below), whose sum is σ = 6973792020. Its totient is φ = 6914186496.

The previous prime is 6943989251. The next prime is 6943989259. The reversal of 6943989257 is 7529893496.

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 1639926016 + 5304063241 = 40496^2 + 72829^2 .

It is a cyclic number.

It is not a de Polignac number, because 6943989257 - 2⁶ = 6943989193 is a prime.

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 6943989257.

It is not an unprimeable number, because it can be changed into a prime (6943989251) 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, 14901032 + ... + 14901497.

It is an arithmetic number, because the mean of its divisors is an integer number (1743448005).

Almost surely, 2^6943989257 is an apocalyptic number.

It is an amenable number.

6943989257 is a deficient number, since it is larger than the sum of its proper divisors (29802763).

6943989257 is a wasteful number, since it uses less digits than its factorization.

6943989257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29802762.

The product of its digits is 29393280, while the sum is 62.

The square root of 6943989257 is about 83330.6021639109. The cubic root of 6943989257 is about 1907.8153852474.

The spelling of 6943989257 in words is "six billion, nine hundred forty-three million, nine hundred eighty-nine thousand, two hundred fifty-seven".