6981321901 has 4 divisors (see below), whose sum is σ = 6993215712. Its totient is φ = 6969428092.

The previous prime is 6981321883. The next prime is 6981321911. The reversal of 6981321901 is 1091231896.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6981321901 - 2⁵ = 6981321869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981321911) 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, 5946025 + ... + 5947198.

It is an arithmetic number, because the mean of its divisors is an integer number (1748303928).

Almost surely, 2^6981321901 is an apocalyptic number.

It is an amenable number.

6981321901 is a deficient number, since it is larger than the sum of its proper divisors (11893811).

6981321901 is a wasteful number, since it uses less digits than its factorization.

6981321901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11893810.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 6981321901 is about 83554.3051015326. The cubic root of 6981321901 is about 1911.2282425541.

The spelling of 6981321901 in words is "six billion, nine hundred eighty-one million, three hundred twenty-one thousand, nine hundred one".