51281651 has 8 divisors (see below), whose sum is σ = 53769984. Its totient is φ = 48814920.

The previous prime is 51281621. The next prime is 51281683. The reversal of 51281651 is 15618215.

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 51281651 - 2¹⁴ = 51265267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51281621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431 + ... + 10136.

It is an arithmetic number, because the mean of its divisors is an integer number (6721248).

Almost surely, 2^51281651 is an apocalyptic number.

51281651 is a deficient number, since it is larger than the sum of its proper divisors (2488333).

51281651 is a wasteful number, since it uses less digits than its factorization.

51281651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10801.

The product of its digits is 2400, while the sum is 29.

The square root of 51281651 is about 7161.1207921665. The cubic root of 51281651 is about 371.5243926701.

Adding to 51281651 its reverse (15618215), we get a palindrome (66899866).

The spelling of 51281651 in words is "fifty-one million, two hundred eighty-one thousand, six hundred fifty-one".