2499991 has 4 divisors (see below), whose sum is σ = 2692312. Its totient is φ = 2307672.

The previous prime is 2499989. The next prime is 2499997. The reversal of 2499991 is 1999942.

2499991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2499991 - 2¹ = 2499989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2499997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96141 + ... + 96166.

It is an arithmetic number, because the mean of its divisors is an integer number (673078).

2^2499991 is an apocalyptic number.

2499991 is a deficient number, since it is larger than the sum of its proper divisors (192321).

2499991 is a wasteful number, since it uses less digits than its factorization.

2499991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192320.

The product of its digits is 52488, while the sum is 43.

The square root of 2499991 is about 1581.1359840317. The cubic root of 2499991 is about 135.7207179645.

It can be divided in two parts, 249999 and 1, that added together give a square (250000 = 500²).

The spelling of 2499991 in words is "two million, four hundred ninety-nine thousand, nine hundred ninety-one".