51222654 has 48 divisors (see below), whose sum is σ = 127475712. Its totient is φ = 14561424.

The previous prime is 51222641. The next prime is 51222659. The reversal of 51222654 is 45622215.

51222654 = 3577² + 3578² + ... + 3580².

51222654 is a `hidden beast` number, since 5 + 1 + 2 + 2 + 2 + 654 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27187 + ... + 29009.

It is an arithmetic number, because the mean of its divisors is an integer number (2655744).

Almost surely, 2^51222654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51222654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63737856).

51222654 is an abundant number, since it is smaller than the sum of its proper divisors (76253058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51222654 is a wasteful number, since it uses less digits than its factorization.

51222654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2058 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 51222654 is about 7157.0003493084. Note that the first 3 decimals coincide. The cubic root of 51222654 is about 371.3818645270.

Adding to 51222654 its reverse (45622215), we get a palindrome (96844869).

It can be divided in two parts, 5122 and 2654, that added together give a 5-th power (7776 = 6⁵).

The spelling of 51222654 in words is "fifty-one million, two hundred twenty-two thousand, six hundred fifty-four".