49138871 has 4 divisors (see below), whose sum is σ = 49386000. Its totient is φ = 48891744.

The previous prime is 49138867. The next prime is 49138907. The reversal of 49138871 is 17883194.

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 49138871 - 2² = 49138867 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 (49138801) 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, 123266 + ... + 123663.

It is an arithmetic number, because the mean of its divisors is an integer number (12346500).

Almost surely, 2^49138871 is an apocalyptic number.

49138871 is a deficient number, since it is larger than the sum of its proper divisors (247129).

49138871 is a wasteful number, since it uses less digits than its factorization.

49138871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247128.

The product of its digits is 48384, while the sum is 41.

The square root of 49138871 is about 7009.9123389669. The cubic root of 49138871 is about 366.2759397967.

The spelling of 49138871 in words is "forty-nine million, one hundred thirty-eight thousand, eight hundred seventy-one".