51248505 has 32 divisors (see below), whose sum is σ = 102233088. Its totient is φ = 21297600.

The previous prime is 51248503. The next prime is 51248507. The reversal of 51248505 is 50584215.

It is an interprime number because it is at equal distance from previous prime (51248503) and next prime (51248507).

It is not a de Polignac number, because 51248505 - 2¹ = 51248503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51248503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21031 + ... + 23340.

It is an arithmetic number, because the mean of its divisors is an integer number (3194784).

Almost surely, 2^51248505 is an apocalyptic number.

51248505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51248505 is a deficient number, since it is larger than the sum of its proper divisors (50984583).

51248505 is a wasteful number, since it uses less digits than its factorization.

51248505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44397.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 51248505 is about 7158.8061155475. The cubic root of 51248505 is about 371.4443302345. Note that the first 3 decimals are identical.

The spelling of 51248505 in words is "fifty-one million, two hundred forty-eight thousand, five hundred five".