6921081 has 12 divisors (see below), whose sum is σ = 10091952. Its totient is φ = 4570296.

The previous prime is 6921077. The next prime is 6921097. The reversal of 6921081 is 1801296.

It is not a de Polignac number, because 6921081 - 2² = 6921077 is a prime.

It is a super-2 number, since 2×6921081² = 95802724417122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6921041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2631 + ... + 4556.

It is an arithmetic number, because the mean of its divisors is an integer number (840996).

Almost surely, 2^6921081 is an apocalyptic number.

It is an amenable number.

6921081 is a deficient number, since it is larger than the sum of its proper divisors (3170871).

6921081 is a wasteful number, since it uses less digits than its factorization.

6921081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300 (or 7297 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 6921081 is about 2630.7947468398. The cubic root of 6921081 is about 190.5715109622.

The spelling of 6921081 in words is "six million, nine hundred twenty-one thousand, eighty-one".