6940579909 has 2 divisors, whose sum is σ = 6940579910. Its totient is φ = 6940579908.

The previous prime is 6940579883. The next prime is 6940579951. The reversal of 6940579909 is 9099750496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6106641025 + 833938884 = 78145^2 + 28878^2 .

It is a cyclic number.

It is not a de Polignac number, because 6940579909 - 2⁹ = 6940579397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6940279909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3470289954 + 3470289955.

It is an arithmetic number, because the mean of its divisors is an integer number (3470289955).

Almost surely, 2^6940579909 is an apocalyptic number.

It is an amenable number.

6940579909 is a deficient number, since it is larger than the sum of its proper divisors (1).

6940579909 is an equidigital number, since it uses as much as digits as its factorization.

6940579909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5511240, while the sum is 58.

The square root of 6940579909 is about 83310.1428938878. The cubic root of 6940579909 is about 1907.5031021526.

The spelling of 6940579909 in words is "six billion, nine hundred forty million, five hundred seventy-nine thousand, nine hundred nine".