6981531 has 16 divisors (see below), whose sum is σ = 9987840. Its totient is φ = 4324320.

The previous prime is 6981503. The next prime is 6981539. The reversal of 6981531 is 1351896.

It is not a de Polignac number, because 6981531 - 2¹⁵ = 6948763 is a prime.

It is a super-2 number, since 2×6981531² = 97483550207922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6981492 and 6981501.

It is not an unprimeable number, because it can be changed into a prime (6981539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1866 + ... + 4176.

It is an arithmetic number, because the mean of its divisors is an integer number (624240).

Almost surely, 2^6981531 is an apocalyptic number.

6981531 is a deficient number, since it is larger than the sum of its proper divisors (3006309).

6981531 is a wasteful number, since it uses less digits than its factorization.

6981531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386.

The product of its digits is 6480, while the sum is 33.

The square root of 6981531 is about 2642.2586928611. The cubic root of 6981531 is about 191.1247323560.

The spelling of 6981531 in words is "six million, nine hundred eighty-one thousand, five hundred thirty-one".