6981481 has 4 divisors (see below), whose sum is σ = 7518532. Its totient is φ = 6444432.

The previous prime is 6981463. The next prime is 6981497. The reversal of 6981481 is 1841896.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1245456 + 5736025 = 1116^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 6981481 - 2⁵ = 6981449 is a prime.

It is a super-2 number, since 2×6981481² = 97482153906722, which contains 22 as substring.

It is a Duffinian number.

6981481 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6981481.

It is not an unprimeable number, because it can be changed into a prime (6981421) 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, 268506 + ... + 268531.

It is an arithmetic number, because the mean of its divisors is an integer number (1879633).

Almost surely, 2^6981481 is an apocalyptic number.

It is an amenable number.

6981481 is a deficient number, since it is larger than the sum of its proper divisors (537051).

6981481 is a wasteful number, since it uses less digits than its factorization.

6981481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537050.

The product of its digits is 13824, while the sum is 37.

The square root of 6981481 is about 2642.2492312422. The cubic root of 6981481 is about 191.1242760922.

The spelling of 6981481 in words is "six million, nine hundred eighty-one thousand, four hundred eighty-one".