49959251821 has 4 divisors (see below), whose sum is σ = 49968104512. Its totient is φ = 49950399132.

The previous prime is 49959251779. The next prime is 49959251911. The reversal of 49959251821 is 12815295994.

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 49959251821 - 2¹⁵ = 49959219053 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 (49959221821) 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, 4417875 + ... + 4429168.

It is an arithmetic number, because the mean of its divisors is an integer number (12492026128).

Almost surely, 2^49959251821 is an apocalyptic number.

It is an amenable number.

49959251821 is a deficient number, since it is larger than the sum of its proper divisors (8852691).

49959251821 is an equidigital number, since it uses as much as digits as its factorization.

49959251821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852690.

The product of its digits is 2332800, while the sum is 55.

The spelling of 49959251821 in words is "forty-nine billion, nine hundred fifty-nine million, two hundred fifty-one thousand, eight hundred twenty-one".