2491870247 has 4 divisors (see below), whose sum is σ = 2492025816. Its totient is φ = 2491714680.

The previous prime is 2491870229. The next prime is 2491870261. The reversal of 2491870247 is 7420781942.

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 2491870247 - 2¹⁰ = 2491869223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2491870198 and 2491870207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491870267) 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, 50588 + ... + 86849.

It is an arithmetic number, because the mean of its divisors is an integer number (623006454).

Almost surely, 2^2491870247 is an apocalyptic number.

2491870247 is a deficient number, since it is larger than the sum of its proper divisors (155569).

2491870247 is a wasteful number, since it uses less digits than its factorization.

2491870247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155568.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 2491870247 is about 49918.6362694335. The cubic root of 2491870247 is about 1355.7360410600.

The spelling of 2491870247 in words is "two billion, four hundred ninety-one million, eight hundred seventy thousand, two hundred forty-seven".