51054209 has 4 divisors (see below), whose sum is σ = 51107760. Its totient is φ = 51000660.

The previous prime is 51054169. The next prime is 51054221. The reversal of 51054209 is 90245015.

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 51054209 - 2¹⁶ = 50988673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51056209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25319 + ... + 27260.

It is an arithmetic number, because the mean of its divisors is an integer number (12776940).

Almost surely, 2^51054209 is an apocalyptic number.

It is an amenable number.

51054209 is a deficient number, since it is larger than the sum of its proper divisors (53551).

51054209 is an equidigital number, since it uses as much as digits as its factorization.

51054209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53550.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 51054209 is about 7145.2228096820. Note that the first 3 decimals coincide. The cubic root of 51054209 is about 370.9743227338.

The spelling of 51054209 in words is "fifty-one million, fifty-four thousand, two hundred nine".