49549991 has 4 divisors (see below), whose sum is σ = 50228832. Its totient is φ = 48871152.

The previous prime is 49549987. The next prime is 49549999. The reversal of 49549991 is 19994594.

49549991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 49549991 - 2² = 49549987 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 (49549999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339311 + ... + 339456.

It is an arithmetic number, because the mean of its divisors is an integer number (12557208).

Almost surely, 2^49549991 is an apocalyptic number.

49549991 is a deficient number, since it is larger than the sum of its proper divisors (678841).

49549991 is an equidigital number, since it uses as much as digits as its factorization.

49549991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678840.

The product of its digits is 524880, while the sum is 50.

The square root of 49549991 is about 7039.1754488718. The cubic root of 49549991 is about 367.2945858700.

The spelling of 49549991 in words is "forty-nine million, five hundred forty-nine thousand, nine hundred ninety-one".