2431981 has 8 divisors (see below), whose sum is σ = 2643200. Its totient is φ = 2229120.

The previous prime is 2431967. The next prime is 2431987. The reversal of 2431981 is 1891342.

It is a happy number.

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 2431981 - 2⁹ = 2431469 is a prime.

It is a super-2 number, since 2×2431981² = 11829063168722, 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 (2431987) 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 7 ways as a sum of consecutive naturals, for example, 1476 + ... + 2653.

It is an arithmetic number, because the mean of its divisors is an integer number (330400).

2^2431981 is an apocalyptic number.

It is an amenable number.

2431981 is a deficient number, since it is larger than the sum of its proper divisors (211219).

2431981 is a wasteful number, since it uses less digits than its factorization.

2431981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179.

The product of its digits is 1728, while the sum is 28.

The square root of 2431981 is about 1559.4810034111. The cubic root of 2431981 is about 134.4786660653.

The spelling of 2431981 in words is "two million, four hundred thirty-one thousand, nine hundred eighty-one".