51667449 has 4 divisors (see below), whose sum is σ = 68889936. Its totient is φ = 34444964.

The previous prime is 51667433. The next prime is 51667457. The reversal of 51667449 is 94476615.

51667449 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.

It is a cyclic number.

It is not a de Polignac number, because 51667449 - 2⁴ = 51667433 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51667449.

It is not an unprimeable number, because it can be changed into a prime (51667409) 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, 8611239 + ... + 8611244.

It is an arithmetic number, because the mean of its divisors is an integer number (17222484).

Almost surely, 2^51667449 is an apocalyptic number.

It is an amenable number.

51667449 is a deficient number, since it is larger than the sum of its proper divisors (17222487).

51667449 is a wasteful number, since it uses less digits than its factorization.

51667449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17222486.

The product of its digits is 181440, while the sum is 42.

The square root of 51667449 is about 7188.0073038360. The cubic root of 51667449 is about 372.4537401827.

The spelling of 51667449 in words is "fifty-one million, six hundred sixty-seven thousand, four hundred forty-nine".