51102 has 24 divisors (see below), whose sum is σ = 117936. Its totient is φ = 15936.

The previous prime is 51071. The next prime is 51109. The reversal of 51102 is 20115.

It is a happy number.

It is a super-2 number, since 2×51102² = 5222828808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51109) by changing a digit.

51102 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223 + ... + 389.

It is an arithmetic number, because the mean of its divisors is an integer number (4914).

2⁵¹¹⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58968).

51102 is an abundant number, since it is smaller than the sum of its proper divisors (66834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51102 is a wasteful number, since it uses less digits than its factorization.

51102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 51102 is about 226.0575148054. The cubic root of 51102 is about 37.1090040942.

Adding to 51102 its reverse (20115), we get a palindrome (71217).

It can be divided in two parts, 51 and 102, that added together give a triangular number (153 = T₁₇).

The spelling of 51102 in words is "fifty-one thousand, one hundred two".