6921539497 has 8 divisors (see below), whose sum is σ = 6993487872. Its totient is φ = 6849864000.

The previous prime is 6921539483. The next prime is 6921539501. The reversal of 6921539497 is 7949351296.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6921539497 - 2¹¹ = 6921537449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921539407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17029 + ... + 118882.

It is an arithmetic number, because the mean of its divisors is an integer number (874185984).

Almost surely, 2^6921539497 is an apocalyptic number.

It is an amenable number.

6921539497 is a deficient number, since it is larger than the sum of its proper divisors (71948375).

6921539497 is a wasteful number, since it uses less digits than its factorization.

6921539497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136439.

The product of its digits is 3674160, while the sum is 55.

The square root of 6921539497 is about 83195.7901398863. The cubic root of 6921539497 is about 1905.7571909754.

The spelling of 6921539497 in words is "six billion, nine hundred twenty-one million, five hundred thirty-nine thousand, four hundred ninety-seven".