6990241521 has 16 divisors (see below), whose sum is σ = 9660708864. Its totient is φ = 4492927824.

The previous prime is 6990241513. The next prime is 6990241523. The reversal of 6990241521 is 1251420996.

It is not a de Polignac number, because 6990241521 - 2³ = 6990241513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6990241521.

It is not an unprimeable number, because it can be changed into a prime (6990241523) 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 15 ways as a sum of consecutive naturals, for example, 360525 + ... + 379418.

It is an arithmetic number, because the mean of its divisors is an integer number (603794304).

Almost surely, 2^6990241521 is an apocalyptic number.

It is an amenable number.

6990241521 is a deficient number, since it is larger than the sum of its proper divisors (2670467343).

6990241521 is a wasteful number, since it uses less digits than its factorization.

6990241521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740060.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 6990241521 is about 83607.6642479623. The cubic root of 6990241521 is about 1912.0418503916.

The spelling of 6990241521 in words is "six billion, nine hundred ninety million, two hundred forty-one thousand, five hundred twenty-one".