49991972311 has 4 divisors (see below), whose sum is σ = 49997093224. Its totient is φ = 49986851400.

The previous prime is 49991972309. The next prime is 49991972351. The reversal of 49991972311 is 11327919994.

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

It is a cyclic number.

It is not a de Polignac number, because 49991972311 - 2¹ = 49991972309 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 (49991972351) 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, 2545785 + ... + 2565346.

It is an arithmetic number, because the mean of its divisors is an integer number (12499273306).

Almost surely, 2^49991972311 is an apocalyptic number.

49991972311 is a deficient number, since it is larger than the sum of its proper divisors (5120913).

49991972311 is an equidigital number, since it uses as much as digits as its factorization.

49991972311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120912.

The product of its digits is 1102248, while the sum is 55.

The spelling of 49991972311 in words is "forty-nine billion, nine hundred ninety-one million, nine hundred seventy-two thousand, three hundred eleven".