51648519 has 16 divisors (see below), whose sum is σ = 74464992. Its totient is φ = 31653888.

The previous prime is 51648497. The next prime is 51648529. The reversal of 51648519 is 91584615.

It is not a de Polignac number, because 51648519 - 2⁹ = 51648007 is a prime.

It is a super-2 number, since 2×51648519² = 5335139029786722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51648529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7447 + ... + 12599.

It is an arithmetic number, because the mean of its divisors is an integer number (4654062).

Almost surely, 2^51648519 is an apocalyptic number.

51648519 is a deficient number, since it is larger than the sum of its proper divisors (22816473).

51648519 is a wasteful number, since it uses less digits than its factorization.

51648519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5426.

The product of its digits is 43200, while the sum is 39.

The square root of 51648519 is about 7186.6904065780. The cubic root of 51648519 is about 372.4082479003.

The spelling of 51648519 in words is "fifty-one million, six hundred forty-eight thousand, five hundred nineteen".