51161 has 4 divisors (see below), whose sum is σ = 55824. Its totient is φ = 46500.

The previous prime is 51157. The next prime is 51169. The reversal of 51161 is 16115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51161 - 2² = 51157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2315 + ... + 2336.

It is an arithmetic number, because the mean of its divisors is an integer number (13956).

2⁵¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

51161 is a deficient number, since it is larger than the sum of its proper divisors (4663).

51161 is a wasteful number, since it uses less digits than its factorization.

51161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4662.

The product of its digits is 30, while the sum is 14.

The square root of 51161 is about 226.1879749235. The cubic root of 51161 is about 37.1232800467.

Adding to 51161 its reverse (16115), we get a palindrome (67276).

It can be divided in two parts, 51 and 161, that added together give a palindrome (212).

The spelling of 51161 in words is "fifty-one thousand, one hundred sixty-one".