49991969 has 4 divisors (see below), whose sum is σ = 51715860. Its totient is φ = 48268080.

The previous prime is 49991927. The next prime is 49991993. The reversal of 49991969 is 96919994.

49991969 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 an emirpimes, since its reverse is a distinct semiprime: 96919994 = 2 ⋅48459997.

It can be written as a sum of positive squares in 2 ways, for example, as 39187600 + 10804369 = 6260^2 + 3287^2 .

It is a cyclic number.

It is not a de Polignac number, because 49991969 - 2²⁰ = 48943393 is a prime.

It is a super-2 number, since 2×49991969² = 4998393928993922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49991999) 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, 861902 + ... + 861959.

It is an arithmetic number, because the mean of its divisors is an integer number (12928965).

Almost surely, 2^49991969 is an apocalyptic number.

It is an amenable number.

49991969 is a deficient number, since it is larger than the sum of its proper divisors (1723891).

49991969 is a wasteful number, since it uses less digits than its factorization.

49991969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723890.

The product of its digits is 1417176, while the sum is 56.

The square root of 49991969 is about 7070.4999116046. The cubic root of 49991969 is about 368.3834245033.

The spelling of 49991969 in words is "forty-nine million, nine hundred ninety-one thousand, nine hundred sixty-nine".