51616385 has 8 divisors (see below), whose sum is σ = 62038440. Its totient is φ = 41227264.

The previous prime is 51616381. The next prime is 51616391. The reversal of 51616385 is 58361615.

It can be written as a sum of positive squares in 4 ways, for example, as 693889 + 50922496 = 833^2 + 7136^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51616385 - 2² = 51616381 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51616381) 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, 4640 + ... + 11169.

It is an arithmetic number, because the mean of its divisors is an integer number (7754805).

Almost surely, 2^51616385 is an apocalyptic number.

It is an amenable number.

51616385 is a deficient number, since it is larger than the sum of its proper divisors (10422055).

51616385 is a wasteful number, since it uses less digits than its factorization.

51616385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16467.

The product of its digits is 21600, while the sum is 35.

The square root of 51616385 is about 7184.4543982129. The cubic root of 51616385 is about 372.3309985132.

The spelling of 51616385 in words is "fifty-one million, six hundred sixteen thousand, three hundred eighty-five".