51172100 has 72 divisors (see below), whose sum is σ = 130075008. Its totient is φ = 17107200.

The previous prime is 51172097. The next prime is 51172133. The reversal of 51172100 is 127115.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27809 + ... + 29591.

Almost surely, 2^51172100 is an apocalyptic number.

51172100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51172100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65037504).

51172100 is an abundant number, since it is smaller than the sum of its proper divisors (78902908).

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

51172100 is a wasteful number, since it uses less digits than its factorization.

51172100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 51172100 is about 7153.4676905680. The cubic root of 51172100 is about 371.2596463463.

Adding to 51172100 its reverse (127115), we get a palindrome (51299215).

The spelling of 51172100 in words is "fifty-one million, one hundred seventy-two thousand, one hundred".