6981981 has 8 divisors (see below), whose sum is σ = 9350880. Its totient is φ = 4633872.

The previous prime is 6981977. The next prime is 6981983. The reversal of 6981981 is 1891896.

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

It is not a de Polignac number, because 6981981 - 2² = 6981977 is a prime.

It is a super-2 number, since 2×6981981² = 97496117368722, which contains 22 as substring.

It is an Ulam number.

6981981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981983) 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, 4395 + ... + 5768.

It is an arithmetic number, because the mean of its divisors is an integer number (1168860).

Almost surely, 2^6981981 is an apocalyptic number.

It is an amenable number.

6981981 is a deficient number, since it is larger than the sum of its proper divisors (2368899).

6981981 is a wasteful number, since it uses less digits than its factorization.

6981981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10395.

The product of its digits is 31104, while the sum is 42.

The square root of 6981981 is about 2642.3438459065. The cubic root of 6981981 is about 191.1288386321.

The spelling of 6981981 in words is "six million, nine hundred eighty-one thousand, nine hundred eighty-one".