51530615 has 8 divisors (see below), whose sum is σ = 61938528. Its totient is φ = 41156640.

The previous prime is 51530597. The next prime is 51530629. The reversal of 51530615 is 51603515.

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

It is not a de Polignac number, because 51530615 - 2¹⁶ = 51465079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5012 + ... + 11321.

It is an arithmetic number, because the mean of its divisors is an integer number (7742316).

Almost surely, 2^51530615 is an apocalyptic number.

51530615 is a deficient number, since it is larger than the sum of its proper divisors (10407913).

51530615 is a wasteful number, since it uses less digits than its factorization.

51530615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16969.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 51530615 is about 7178.4827784149. The cubic root of 51530615 is about 372.1246523139.

Subtracting 51530615 from its reverse (51603515), we obtain a square (72900 = 270²).

The spelling of 51530615 in words is "fifty-one million, five hundred thirty thousand, six hundred fifteen".