6961981 has 8 divisors (see below), whose sum is σ = 7576184. Its totient is φ = 6359040.

The previous prime is 6961979. The next prime is 6962003. The reversal of 6961981 is 1891696.

It can be written as a sum of positive squares in 4 ways, for example, as 24025 + 6937956 = 155^2 + 2634^2 .

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 6961981 - 2¹ = 6961979 is a prime.

It is a super-2 number, since 2×6961981² = 96938358888722, 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 (6961931) 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, 1500 + ... + 4021.

It is an arithmetic number, because the mean of its divisors is an integer number (947023).

Almost surely, 2^6961981 is an apocalyptic number.

It is an amenable number.

6961981 is a deficient number, since it is larger than the sum of its proper divisors (614203).

6961981 is a wasteful number, since it uses less digits than its factorization.

6961981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5631.

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

The square root of 6961981 is about 2638.5566129989. The cubic root of 6961981 is about 190.9461668594.

The spelling of 6961981 in words is "six million, nine hundred sixty-one thousand, nine hundred eighty-one".