6917981 has 8 divisors (see below), whose sum is σ = 7928064. Its totient is φ = 5913360.

The previous prime is 6917959. The next prime is 6917983. The reversal of 6917981 is 1897196.

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 6917981 - 2¹⁰ = 6916957 is a prime.

It is a super-2 number, since 2×6917981² = 95716922232722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6917983) 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, 1871 + ... + 4163.

It is an arithmetic number, because the mean of its divisors is an integer number (991008).

Almost surely, 2^6917981 is an apocalyptic number.

It is an amenable number.

6917981 is a deficient number, since it is larger than the sum of its proper divisors (1010083).

6917981 is a wasteful number, since it uses less digits than its factorization.

6917981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731.

The product of its digits is 27216, while the sum is 41.

The square root of 6917981 is about 2630.2055052790. The cubic root of 6917981 is about 190.5430539476.

The spelling of 6917981 in words is "six million, nine hundred seventeen thousand, nine hundred eighty-one".