51000505 has 4 divisors (see below), whose sum is σ = 61200612. Its totient is φ = 40800400.

The previous prime is 51000491. The next prime is 51000511. The reversal of 51000505 is 50500015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8111104 + 42889401 = 2848^2 + 6549^2 .

It is not a de Polignac number, because 51000505 - 2¹⁵ = 50967737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5100046 + ... + 5100055.

It is an arithmetic number, because the mean of its divisors is an integer number (15300153).

Almost surely, 2^51000505 is an apocalyptic number.

It is an amenable number.

51000505 is a deficient number, since it is larger than the sum of its proper divisors (10200107).

51000505 is a wasteful number, since it uses less digits than its factorization.

51000505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200106.

The product of its (nonzero) digits is 125, while the sum is 16.

The square root of 51000505 is about 7141.4637855274. The cubic root of 51000505 is about 370.8442009468.

The spelling of 51000505 in words is "fifty-one million, five hundred five", and thus it is an aban number.