51555305 has 16 divisors (see below), whose sum is σ = 68356224. Its totient is φ = 37128960.

The previous prime is 51555299. The next prime is 51555307. The reversal of 51555305 is 50355515.

It is not a de Polignac number, because 51555305 - 2⁴ = 51555289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555307) 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, 11231 + ... + 15140.

It is an arithmetic number, because the mean of its divisors is an integer number (4272264).

Almost surely, 2^51555305 is an apocalyptic number.

It is an amenable number.

51555305 is a deficient number, since it is larger than the sum of its proper divisors (16800919).

51555305 is a wasteful number, since it uses less digits than its factorization.

51555305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26416.

The product of its (nonzero) digits is 9375, while the sum is 29.

The square root of 51555305 is about 7180.2022952003. The cubic root of 51555305 is about 372.1840751811.

The spelling of 51555305 in words is "fifty-one million, five hundred fifty-five thousand, three hundred five".