51608221 has 12 divisors (see below), whose sum is σ = 60316032. Its totient is φ = 44027928.

The previous prime is 51608201. The next prime is 51608231. The reversal of 51608221 is 12280615.

It is not a de Polignac number, because 51608221 - 2⁹ = 51607709 is a prime.

It is a super-3 number, since 3×51608221³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51608201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8566 + ... + 13288.

It is an arithmetic number, because the mean of its divisors is an integer number (5026336).

Almost surely, 2^51608221 is an apocalyptic number.

It is an amenable number.

51608221 is a deficient number, since it is larger than the sum of its proper divisors (8707811).

51608221 is a wasteful number, since it uses less digits than its factorization.

51608221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960 (or 4953 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 51608221 is about 7183.8862045553. The cubic root of 51608221 is about 372.3113673402.

Adding to 51608221 its reverse (12280615), we get a palindrome (63888836).

The spelling of 51608221 in words is "fifty-one million, six hundred eight thousand, two hundred twenty-one".