2319981 has 8 divisors (see below), whose sum is σ = 3107520. Its totient is φ = 1539552.

The previous prime is 2319959. The next prime is 2319997. The reversal of 2319981 is 1899132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2319981 - 2⁶ = 2319917 is a prime.

It is a super-2 number, since 2×2319981² = 10764623680722, which contains 22 as substring.

It is a plaindrome in base 14 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2319901) 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, 961 + ... + 2358.

It is an arithmetic number, because the mean of its divisors is an integer number (388440).

2^2319981 is an apocalyptic number.

It is an amenable number.

2319981 is a deficient number, since it is larger than the sum of its proper divisors (787539).

2319981 is a wasteful number, since it uses less digits than its factorization.

2319981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555.

The product of its digits is 3888, while the sum is 33.

The square root of 2319981 is about 1523.1483841045. The cubic root of 2319981 is about 132.3817575716.

The spelling of 2319981 in words is "two million, three hundred nineteen thousand, nine hundred eighty-one".