51615615 has 8 divisors (see below), whose sum is σ = 82585008. Its totient is φ = 27528320.

The previous prime is 51615607. The next prime is 51615643. The reversal of 51615615 is 51651615.

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

It is not a de Polignac number, because 51615615 - 2³ = 51615607 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1720506 + ... + 1720535.

It is an arithmetic number, because the mean of its divisors is an integer number (10323126).

Almost surely, 2^51615615 is an apocalyptic number.

51615615 is a deficient number, since it is larger than the sum of its proper divisors (30969393).

51615615 is a wasteful number, since it uses less digits than its factorization.

51615615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3441049.

The product of its digits is 4500, while the sum is 30.

The square root of 51615615 is about 7184.4008100885. The cubic root of 51615615 is about 372.3291470579.

The spelling of 51615615 in words is "fifty-one million, six hundred fifteen thousand, six hundred fifteen".