6991439590 has 16 divisors (see below), whose sum is σ = 12594317472. Its totient is φ = 2794414464.

The previous prime is 6991439573. The next prime is 6991439593. The reversal of 6991439590 is 959341996.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991439593) 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 7 ways as a sum of consecutive naturals, for example, 256554 + ... + 282493.

It is an arithmetic number, because the mean of its divisors is an integer number (787144842).

Almost surely, 2^6991439590 is an apocalyptic number.

6991439590 is a deficient number, since it is larger than the sum of its proper divisors (5602877882).

6991439590 is a wasteful number, since it uses less digits than its factorization.

6991439590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540351.

The product of its (nonzero) digits is 2361960, while the sum is 55.

The square root of 6991439590 is about 83614.8287685863. The cubic root of 6991439590 is about 1912.1510801514.

The spelling of 6991439590 in words is "six billion, nine hundred ninety-one million, four hundred thirty-nine thousand, five hundred ninety".