49998991 has 4 divisors (see below), whose sum is σ = 57141712. Its totient is φ = 42856272.

The previous prime is 49998983. The next prime is 49999031. The reversal of 49998991 is 19989994.

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 49998991 - 2³ = 49998983 is a prime.

It is a super-3 number, since 3×49998991³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49998911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571350 + ... + 3571363.

It is an arithmetic number, because the mean of its divisors is an integer number (14285428).

Almost surely, 2^49998991 is an apocalyptic number.

49998991 is a deficient number, since it is larger than the sum of its proper divisors (7142721).

49998991 is an equidigital number, since it uses as much as digits as its factorization.

49998991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142720.

The product of its digits is 1889568, while the sum is 58.

The square root of 49998991 is about 7070.9964644313. The cubic root of 49998991 is about 368.4006717222.

The spelling of 49998991 in words is "forty-nine million, nine hundred ninety-eight thousand, nine hundred ninety-one".