51840519 has 12 divisors (see below), whose sum is σ = 70548408. Its totient is φ = 33848880.

The previous prime is 51840491. The next prime is 51840539. The reversal of 51840519 is 91504815.

It is not a de Polignac number, because 51840519 - 2⁹ = 51840007 is a prime.

It is a super-2 number, since 2×51840519² = 5374878820378722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51840519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51840539) 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 11 ways as a sum of consecutive naturals, for example, 90504 + ... + 91074.

It is an arithmetic number, because the mean of its divisors is an integer number (5879034).

Almost surely, 2^51840519 is an apocalyptic number.

51840519 is a deficient number, since it is larger than the sum of its proper divisors (18707889).

51840519 is an frugal number, since it uses more digits than its factorization.

51840519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 51840519 is about 7200.0360415765. The cubic root of 51840519 is about 372.8691450418.

The spelling of 51840519 in words is "fifty-one million, eight hundred forty thousand, five hundred nineteen".