51135661 has 8 divisors (see below), whose sum is σ = 51932160. Its totient is φ = 50345568.

The previous prime is 51135659. The next prime is 51135683. The reversal of 51135661 is 16653115.

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 51135661 - 2¹ = 51135659 is a prime.

It is a super-2 number, since 2×51135661² = 5229711651813842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51135611) 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 7 ways as a sum of consecutive naturals, for example, 15930 + ... + 18868.

It is an arithmetic number, because the mean of its divisors is an integer number (6491520).

Almost surely, 2^51135661 is an apocalyptic number.

It is an amenable number.

51135661 is a deficient number, since it is larger than the sum of its proper divisors (796499).

51135661 is a wasteful number, since it uses less digits than its factorization.

51135661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203.

The product of its digits is 2700, while the sum is 28.

The square root of 51135661 is about 7150.9202904242. The cubic root of 51135661 is about 371.1715023339.

Adding to 51135661 its reverse (16653115), we get a palindrome (67788776).

The spelling of 51135661 in words is "fifty-one million, one hundred thirty-five thousand, six hundred sixty-one".