51516505 has 12 divisors (see below), whose sum is σ = 65247012. Its totient is φ = 39042720.

The previous prime is 51516503. The next prime is 51516539. The reversal of 51516505 is 50561515.

It can be written as a sum of positive squares in 2 ways, for example, as 15468489 + 36048016 = 3933^2 + 6004^2 .

It is not a de Polignac number, because 51516505 - 2¹ = 51516503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51516503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12466 + ... + 16075.

It is an arithmetic number, because the mean of its divisors is an integer number (5437251).

Almost surely, 2^51516505 is an apocalyptic number.

It is an amenable number.

51516505 is a deficient number, since it is larger than the sum of its proper divisors (13730507).

51516505 is a wasteful number, since it uses less digits than its factorization.

51516505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28584 (or 28565 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51516505 is about 7177.4999129223. The cubic root of 51516505 is about 372.0906844280.

It can be divided in two parts, 515 and 16505, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 51516505 in words is "fifty-one million, five hundred sixteen thousand, five hundred five".