2491018 has 4 divisors (see below), whose sum is σ = 3736530. Its totient is φ = 1245508.

The previous prime is 2491009. The next prime is 2491031. The reversal of 2491018 is 8101942.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1620529 + 870489 = 1273^2 + 933^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2490983 and 2491001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622753 + ... + 622756.

2^2491018 is an apocalyptic number.

2491018 is a deficient number, since it is larger than the sum of its proper divisors (1245512).

2491018 is a wasteful number, since it uses less digits than its factorization.

2491018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245511.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 2491018 is about 1578.2959164871. The cubic root of 2491018 is about 135.5581464563.

The spelling of 2491018 in words is "two million, four hundred ninety-one thousand, eighteen".