51681161 has 16 divisors (see below), whose sum is σ = 63763200. Its totient is φ = 40907328.

The previous prime is 51681127. The next prime is 51681167. The reversal of 51681161 is 16118615.

It is not a de Polignac number, because 51681161 - 2¹⁰ = 51680137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51681167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 866 + ... + 10203.

It is an arithmetic number, because the mean of its divisors is an integer number (3985200).

Almost surely, 2^51681161 is an apocalyptic number.

It is an amenable number.

51681161 is a deficient number, since it is larger than the sum of its proper divisors (12082039).

51681161 is a wasteful number, since it uses less digits than its factorization.

51681161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11128.

The product of its digits is 1440, while the sum is 29.

The square root of 51681161 is about 7188.9610515011. The cubic root of 51681161 is about 372.4866857094.

Adding to 51681161 its reverse (16118615), we get a palindrome (67799776).

The spelling of 51681161 in words is "fifty-one million, six hundred eighty-one thousand, one hundred sixty-one".