6981539739 has 4 divisors (see below), whose sum is σ = 9308719656. Its totient is φ = 4654359824.

The previous prime is 6981539713. The next prime is 6981539777. The reversal of 6981539739 is 9379351896.

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

It is a cyclic number.

It is not a de Polignac number, because 6981539739 - 2¹² = 6981535643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6981539339) 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, 1163589954 + ... + 1163589959.

It is an arithmetic number, because the mean of its divisors is an integer number (2327179914).

Almost surely, 2^6981539739 is an apocalyptic number.

6981539739 is a deficient number, since it is larger than the sum of its proper divisors (2327179917).

6981539739 is a wasteful number, since it uses less digits than its factorization.

6981539739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327179916.

The product of its digits is 11022480, while the sum is 60.

The square root of 6981539739 is about 83555.6086627343. The cubic root of 6981539739 is about 1911.2481210152.

The spelling of 6981539739 in words is "six billion, nine hundred eighty-one million, five hundred thirty-nine thousand, seven hundred thirty-nine".