51605516 has 6 divisors (see below), whose sum is σ = 90309660. Its totient is φ = 25802756.

The previous prime is 51605503. The next prime is 51605527. The reversal of 51605516 is 61550615.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6450686 + ... + 6450693.

It is an arithmetic number, because the mean of its divisors is an integer number (15051610).

Almost surely, 2^51605516 is an apocalyptic number.

It is an amenable number.

51605516 is a deficient number, since it is larger than the sum of its proper divisors (38704144).

51605516 is a wasteful number, since it uses less digits than its factorization.

51605516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12901383 (or 12901381 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51605516 is about 7183.6979335159. The cubic root of 51605516 is about 372.3048624345.

The spelling of 51605516 in words is "fifty-one million, six hundred five thousand, five hundred sixteen".