51386081 has 8 divisors (see below), whose sum is σ = 53073384. Its totient is φ = 49714560.

The previous prime is 51386063. The next prime is 51386107. The reversal of 51386081 is 18068315.

It can be written as a sum of positive squares in 4 ways, for example, as 5958481 + 45427600 = 2441^2 + 6740^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51386081 - 2¹⁰ = 51385057 is a prime.

It is a super-2 number, since 2×51386081² = 5281058641077122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51386011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2861 + ... + 10533.

It is an arithmetic number, because the mean of its divisors is an integer number (6634173).

Almost surely, 2^51386081 is an apocalyptic number.

It is an amenable number.

51386081 is a deficient number, since it is larger than the sum of its proper divisors (1687303).

51386081 is a wasteful number, since it uses less digits than its factorization.

51386081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 51386081 is about 7168.4085402549. The cubic root of 51386081 is about 371.7764125449.

The spelling of 51386081 in words is "fifty-one million, three hundred eighty-six thousand, eighty-one".