51212505 has 16 divisors (see below), whose sum is σ = 86253120. Its totient is φ = 25875648.

The previous prime is 51212503. The next prime is 51212507. The reversal of 51212505 is 50521215.

51212505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51212503) and next prime (51212507).

It is not a de Polignac number, because 51212505 - 2¹ = 51212503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51212503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89562 + ... + 90131.

It is an arithmetic number, because the mean of its divisors is an integer number (5390820).

Almost surely, 2^51212505 is an apocalyptic number.

It is an amenable number.

51212505 is a deficient number, since it is larger than the sum of its proper divisors (35040615).

51212505 is a wasteful number, since it uses less digits than its factorization.

51212505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179720.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51212505 is about 7156.2912880905. The cubic root of 51212505 is about 371.3573349930.

It can be divided in two parts, 5121 and 2505, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 51212505 in words is "fifty-one million, two hundred twelve thousand, five hundred five".