51602721 has 8 divisors (see below), whose sum is σ = 69674880. Its totient is φ = 33966192.

The previous prime is 51602711. The next prime is 51602737. The reversal of 51602721 is 12720615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51602721 - 2¹⁷ = 51471649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51602691 and 51602700.

It is not an unprimeable number, because it can be changed into a prime (51602711) 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 7 ways as a sum of consecutive naturals, for example, 108630 + ... + 109103.

It is an arithmetic number, because the mean of its divisors is an integer number (8709360).

Almost surely, 2^51602721 is an apocalyptic number.

It is an amenable number.

51602721 is a deficient number, since it is larger than the sum of its proper divisors (18072159).

51602721 is a wasteful number, since it uses less digits than its factorization.

51602721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217815.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 51602721 is about 7183.5033931919. The cubic root of 51602721 is about 372.2981408605.

The spelling of 51602721 in words is "fifty-one million, six hundred two thousand, seven hundred twenty-one".