6231981 has 16 divisors (see below), whose sum is σ = 9996800. Its totient is φ = 3373488.

The previous prime is 6231949. The next prime is 6232043. The reversal of 6231981 is 1891326.

It is not a de Polignac number, because 6231981 - 2⁵ = 6231949 is a prime.

It is a super-2 number, since 2×6231981² = 77675174368722, 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 (6231481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7411 + ... + 8208.

It is an arithmetic number, because the mean of its divisors is an integer number (624800).

Almost surely, 2^6231981 is an apocalyptic number.

It is an amenable number.

6231981 is a deficient number, since it is larger than the sum of its proper divisors (3764819).

6231981 is a wasteful number, since it uses less digits than its factorization.

6231981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15648.

The product of its digits is 2592, while the sum is 30.

The square root of 6231981 is about 2496.3935987740. The cubic root of 6231981 is about 184.0243843707.

The spelling of 6231981 in words is "six million, two hundred thirty-one thousand, nine hundred eighty-one".