2491438905289 has 4 divisors (see below), whose sum is σ = 2491596696960. Its totient is φ = 2491281113620.

The previous prime is 2491438905287. The next prime is 2491438905311. The reversal of 2491438905289 is 9825098341942.

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 not a de Polignac number, because 2491438905289 - 2¹ = 2491438905287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2491438905289.

It is not an unprimeable number, because it can be changed into a prime (2491438905287) 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, 78872149 + ... + 78903730.

It is an arithmetic number, because the mean of its divisors is an integer number (622899174240).

Almost surely, 2^{2491438905289} is an apocalyptic number.

It is an amenable number.

2491438905289 is a deficient number, since it is larger than the sum of its proper divisors (157791671).

2491438905289 is a wasteful number, since it uses less digits than its factorization.

2491438905289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157791670.

The product of its (nonzero) digits is 44789760, while the sum is 64.

The spelling of 2491438905289 in words is "two trillion, four hundred ninety-one billion, four hundred thirty-eight million, nine hundred five thousand, two hundred eighty-nine".