2331681 has 8 divisors (see below), whose sum is σ = 3391584. Its totient is φ = 1413120.

The previous prime is 2331677. The next prime is 2331689. The reversal of 2331681 is 1861332.

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

It is not a de Polignac number, because 2331681 - 2² = 2331677 is a prime.

It is a super-2 number, since 2×2331681² = 10873472571522, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

2331681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2331689) 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, 35296 + ... + 35361.

It is an arithmetic number, because the mean of its divisors is an integer number (423948).

2^2331681 is an apocalyptic number.

It is an amenable number.

2331681 is a deficient number, since it is larger than the sum of its proper divisors (1059903).

2331681 is a wasteful number, since it uses less digits than its factorization.

2331681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70671.

The product of its digits is 864, while the sum is 24.

The square root of 2331681 is about 1526.9842828268. The cubic root of 2331681 is about 132.6039246374.

It can be divided in two parts, 23316 and 81, that multiplied together give a triangular number (1888596 = T₁₉₄₃).

The spelling of 2331681 in words is "two million, three hundred thirty-one thousand, six hundred eighty-one".