51005505 has 32 divisors (see below), whose sum is σ = 83369088. Its totient is φ = 26624000.

The previous prime is 51005503. The next prime is 51005533. The reversal of 51005505 is 50550015.

It is not a de Polignac number, because 51005505 - 2¹ = 51005503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51005503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198337 + ... + 198593.

It is an arithmetic number, because the mean of its divisors is an integer number (2605284).

Almost surely, 2^51005505 is an apocalyptic number.

It is an amenable number.

51005505 is a deficient number, since it is larger than the sum of its proper divisors (32363583).

51005505 is a wasteful number, since it uses less digits than its factorization.

51005505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 51005505 is about 7141.8138452357. The cubic root of 51005505 is about 370.8563195223.

The spelling of 51005505 in words is "fifty-one million, five thousand, five hundred five".