51006505 has 32 divisors (see below), whose sum is σ = 69932160. Its totient is φ = 35374080.

The previous prime is 51006493. The next prime is 51006509. The reversal of 51006505 is 50560015.

It is not a de Polignac number, because 51006505 - 2⁹ = 51005993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51006509) 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, 180094 + ... + 180376.

It is an arithmetic number, because the mean of its divisors is an integer number (2185380).

Almost surely, 2^51006505 is an apocalyptic number.

51006505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51006505 is a deficient number, since it is larger than the sum of its proper divisors (18925655).

51006505 is a wasteful number, since it uses less digits than its factorization.

51006505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51006505 is about 7141.8838551183. The cubic root of 51006505 is about 370.8587431424.

The spelling of 51006505 in words is "fifty-one million, six thousand, five hundred five".