2491857349 has 8 divisors (see below), whose sum is σ = 2497544280. Its totient is φ = 2486178816.

The previous prime is 2491857343. The next prime is 2491857377. The reversal of 2491857349 is 9437581942.

It can be written as a sum of positive squares in 4 ways, for example, as 1189008324 + 1302849025 = 34482^2 + 36095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2491857349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2491857296 and 2491857305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491857343) 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, 1318197 + ... + 1320085.

It is an arithmetic number, because the mean of its divisors is an integer number (312193035).

Almost surely, 2^2491857349 is an apocalyptic number.

It is an amenable number.

2491857349 is a deficient number, since it is larger than the sum of its proper divisors (5686931).

2491857349 is a wasteful number, since it uses less digits than its factorization.

2491857349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199.

The product of its digits is 2177280, while the sum is 52.

The square root of 2491857349 is about 49918.5070790383. The cubic root of 2491857349 is about 1355.7337019449.

The spelling of 2491857349 in words is "two billion, four hundred ninety-one million, eight hundred fifty-seven thousand, three hundred forty-nine".