49609821 has 4 divisors (see below), whose sum is σ = 66146432. Its totient is φ = 33073212.

The previous prime is 49609793. The next prime is 49609841. The reversal of 49609821 is 12890694.

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.

It is not a de Polignac number, because 49609821 - 2⁹ = 49609309 is a prime.

It is a super-2 number, since 2×49609821² = 4922268679304082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49609821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49609841) 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, 8268301 + ... + 8268306.

It is an arithmetic number, because the mean of its divisors is an integer number (16536608).

Almost surely, 2^49609821 is an apocalyptic number.

It is an amenable number.

49609821 is a deficient number, since it is larger than the sum of its proper divisors (16536611).

49609821 is a wasteful number, since it uses less digits than its factorization.

49609821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16536610.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 49609821 is about 7043.4239542995. The cubic root of 49609821 is about 367.4423584916.

The spelling of 49609821 in words is "forty-nine million, six hundred nine thousand, eight hundred twenty-one".