49881989 has 4 divisors (see below), whose sum is σ = 49969920. Its totient is φ = 49794060.

The previous prime is 49881977. The next prime is 49881991. The reversal of 49881989 is 98918894.

49881989 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98918894 = 2 ⋅49459447.

It is a cyclic number.

It is not a de Polignac number, because 49881989 - 2¹⁶ = 49816453 is a prime.

It is a super-2 number, since 2×49881989² = 4976425653192242, which contains 22 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 (49881389) 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, 43109 + ... + 44250.

It is an arithmetic number, because the mean of its divisors is an integer number (12492480).

Almost surely, 2^49881989 is an apocalyptic number.

It is an amenable number.

49881989 is a deficient number, since it is larger than the sum of its proper divisors (87931).

49881989 is an equidigital number, since it uses as much as digits as its factorization.

49881989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87930.

The product of its digits is 1492992, while the sum is 56.

The square root of 49881989 is about 7062.7182444155. The cubic root of 49881989 is about 368.1130840437.

The spelling of 49881989 in words is "forty-nine million, eight hundred eighty-one thousand, nine hundred eighty-nine".