49909287821 has 4 divisors (see below), whose sum is σ = 50227181532. Its totient is φ = 49591394112.

The previous prime is 49909287817. The next prime is 49909287829. The reversal of 49909287821 is 12878290994.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24246849796 + 25662438025 = 155714^2 + 160195^2 .

It is a cyclic number.

It is not a de Polignac number, because 49909287821 - 2² = 49909287817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49909287829) 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, 158946620 + ... + 158946933.

It is an arithmetic number, because the mean of its divisors is an integer number (12556795383).

Almost surely, 2^49909287821 is an apocalyptic number.

It is an amenable number.

49909287821 is a deficient number, since it is larger than the sum of its proper divisors (317893711).

49909287821 is a wasteful number, since it uses less digits than its factorization.

49909287821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317893710.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 49909287821 in words is "forty-nine billion, nine hundred nine million, two hundred eighty-seven thousand, eight hundred twenty-one".