2491857367349 has 4 divisors (see below), whose sum is σ = 2847836991264. Its totient is φ = 2135877743436.

The previous prime is 2491857367247. The next prime is 2491857367409. The reversal of 2491857367349 is 9437637581942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2491857367349 is a prime.

It is a super-2 number, since 2×2491857367349² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491857364349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177989811947 + ... + 177989811960.

It is an arithmetic number, because the mean of its divisors is an integer number (711959247816).

Almost surely, 2^{2491857367349} is an apocalyptic number.

It is an amenable number.

2491857367349 is a deficient number, since it is larger than the sum of its proper divisors (355979623915).

2491857367349 is an equidigital number, since it uses as much as digits as its factorization.

2491857367349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355979623914.

The product of its digits is 274337280, while the sum is 68.

The spelling of 2491857367349 in words is "two trillion, four hundred ninety-one billion, eight hundred fifty-seven million, three hundred sixty-seven thousand, three hundred forty-nine".