2499681 has 8 divisors (see below), whose sum is σ = 3341664. Its totient is φ = 1662080.

The previous prime is 2499671. The next prime is 2499689. The reversal of 2499681 is 1869942.

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 2499681 - 2⁹ = 2499169 is a prime.

It is a super-2 number, since 2×2499681² = 12496810203522, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (2499689) 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, 625 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (417708).

2^2499681 is an apocalyptic number.

It is an amenable number.

2499681 is a deficient number, since it is larger than the sum of its proper divisors (841983).

2499681 is a wasteful number, since it uses less digits than its factorization.

2499681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191.

The product of its digits is 31104, while the sum is 39.

The square root of 2499681 is about 1581.0379502087. The cubic root of 2499681 is about 135.7151079227.

The spelling of 2499681 in words is "two million, four hundred ninety-nine thousand, six hundred eighty-one".