51172002 has 48 divisors (see below), whose sum is σ = 129422592. Its totient is φ = 14307840.

The previous prime is 51171947. The next prime is 51172003. The reversal of 51172002 is 20027115.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51172003) 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 23 ways as a sum of consecutive naturals, for example, 1602 + ... + 10242.

It is an arithmetic number, because the mean of its divisors is an integer number (2696304).

Almost surely, 2^51172002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51172002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64711296).

51172002 is an abundant number, since it is smaller than the sum of its proper divisors (78250590).

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

51172002 is a wasteful number, since it uses less digits than its factorization.

51172002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8703 (or 8700 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51172002 is about 7153.4608407400. The cubic root of 51172002 is about 371.2594093456.

Adding to 51172002 its reverse (20027115), we get a palindrome (71199117).

The spelling of 51172002 in words is "fifty-one million, one hundred seventy-two thousand, two".