51221446 has 16 divisors (see below), whose sum is σ = 78971904. Its totient is φ = 24904584.

The previous prime is 51221441. The next prime is 51221491. The reversal of 51221446 is 64412215.

It is a happy number.

51221446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51221446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221441) 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 7 ways as a sum of consecutive naturals, for example, 13651 + ... + 16993.

It is an arithmetic number, because the mean of its divisors is an integer number (4935744).

Almost surely, 2^51221446 is an apocalyptic number.

51221446 is a deficient number, since it is larger than the sum of its proper divisors (27750458).

51221446 is a wasteful number, since it uses less digits than its factorization.

51221446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555.

The product of its digits is 1920, while the sum is 25.

The square root of 51221446 is about 7156.9159559129. The cubic root of 51221446 is about 371.3789450322.

The spelling of 51221446 in words is "fifty-one million, two hundred twenty-one thousand, four hundred forty-six".