51016081 has 4 divisors (see below), whose sum is σ = 52394932. Its totient is φ = 49637232.

The previous prime is 51016079. The next prime is 51016087. The reversal of 51016081 is 18061015.

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 46457856 + 4558225 = 6816^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 51016081 - 2¹ = 51016079 is a prime.

It is a super-2 number, since 2×51016081² = 5205281041197122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51016087) 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, 689370 + ... + 689443.

It is an arithmetic number, because the mean of its divisors is an integer number (13098733).

Almost surely, 2^51016081 is an apocalyptic number.

It is an amenable number.

51016081 is a deficient number, since it is larger than the sum of its proper divisors (1378851).

51016081 is a wasteful number, since it uses less digits than its factorization.

51016081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378850.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 51016081 is about 7142.5542350058. The cubic root of 51016081 is about 370.8819501242.

Adding to 51016081 its reverse (18061015), we get a palindrome (69077096).

The spelling of 51016081 in words is "fifty-one million, sixteen thousand, eighty-one".