2401681 has 4 divisors (see below), whose sum is σ = 2404864. Its totient is φ = 2398500.

The previous prime is 2401673. The next prime is 2401703. The reversal of 2401681 is 1861042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2401681 - 2³ = 2401673 is a prime.

It is a super-2 number, since 2×2401681² = 11536143251522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2401621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256 + ... + 2206.

It is an arithmetic number, because the mean of its divisors is an integer number (601216).

2^2401681 is an apocalyptic number.

It is an amenable number.

2401681 is a deficient number, since it is larger than the sum of its proper divisors (3183).

2401681 is a wasteful number, since it uses less digits than its factorization.

2401681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3182.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2401681 is about 1549.7357839322. The cubic root of 2401681 is about 133.9178415209.

The spelling of 2401681 in words is "two million, four hundred one thousand, six hundred eighty-one".