51516085 has 4 divisors (see below), whose sum is σ = 61819308. Its totient is φ = 41212864.

The previous prime is 51516083. The next prime is 51516097. The reversal of 51516085 is 58061515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58061515 = 5 ⋅11612303.

It can be written as a sum of positive squares in 2 ways, for example, as 21846276 + 29669809 = 4674^2 + 5447^2 .

It is a cyclic number.

It is not a de Polignac number, because 51516085 - 2¹ = 51516083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51516083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5151604 + ... + 5151613.

It is an arithmetic number, because the mean of its divisors is an integer number (15454827).

Almost surely, 2^51516085 is an apocalyptic number.

It is an amenable number.

51516085 is a deficient number, since it is larger than the sum of its proper divisors (10303223).

51516085 is a wasteful number, since it uses less digits than its factorization.

51516085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10303222.

The product of its (nonzero) digits is 6000, while the sum is 31.

The square root of 51516085 is about 7177.4706547641. The cubic root of 51516085 is about 372.0896732406.

It can be divided in two parts, 5151 and 6085, that added together give a square (11236 = 106²).

The spelling of 51516085 in words is "fifty-one million, five hundred sixteen thousand, eighty-five".