51222609 has 12 divisors (see below), whose sum is σ = 74058036. Its totient is φ = 34116192.

The previous prime is 51222583. The next prime is 51222617. The reversal of 51222609 is 90622215.

51222609 is a `hidden beast` number, since 51 + 2 + 2 + 2 + 609 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46621584 + 4601025 = 6828^2 + 2145^2 .

It is not a de Polignac number, because 51222609 - 2⁷ = 51222481 is a prime.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11119 + ... + 15035.

It is an arithmetic number, because the mean of its divisors is an integer number (6171503).

Almost surely, 2^51222609 is an apocalyptic number.

It is an amenable number.

51222609 is a deficient number, since it is larger than the sum of its proper divisors (22835427).

51222609 is a wasteful number, since it uses less digits than its factorization.

51222609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5376 (or 5373 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 51222609 is about 7156.9972055325. The cubic root of 51222609 is about 371.3817557718.

The spelling of 51222609 in words is "fifty-one million, two hundred twenty-two thousand, six hundred nine".