51222649 has 9 divisors (see below), whose sum is σ = 54542541. Its totient is φ = 48095040.

The previous prime is 51222641. The next prime is 51222659. The reversal of 51222649 is 94622215.

The square root of 51222649 is 7157.

It is a perfect power (a square), and thus also a powerful number.

51222649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8555625 + 42667024 = 2925^2 + 6532^2 .

It is not a de Polignac number, because 51222649 - 2³ = 51222641 is a prime.

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 51222649.

It is not an unprimeable number, because it can be changed into a prime (51222641) 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 8 ways as a sum of consecutive naturals, for example, 121459 + ... + 121879.

Almost surely, 2^51222649 is an apocalyptic number.

51222649 is the 7157-th square number.

51222649 is the 3579-th centered octagonal number.

It is an amenable number.

51222649 is a deficient number, since it is larger than the sum of its proper divisors (3319892).

51222649 is an frugal number, since it uses more digits than its factorization.

51222649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876 (or 438 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The cubic root of 51222649 is about 371.3818524431.

The spelling of 51222649 in words is "fifty-one million, two hundred twenty-two thousand, six hundred forty-nine".