51031100 has 18 divisors (see below), whose sum is σ = 110737704. Its totient is φ = 20412400.

The previous prime is 51031081. The next prime is 51031109. The reversal of 51031100 is 113015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51031109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255056 + ... + 255255.

Almost surely, 2^51031100 is an apocalyptic number.

51031100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51031100 is an abundant number, since it is smaller than the sum of its proper divisors (59706604).

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

51031100 is a wasteful number, since it uses less digits than its factorization.

51031100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510325 (or 510318 counting only the distinct ones).

The product of its (nonzero) digits is 15, while the sum is 11.

The square root of 51031100 is about 7143.6055322225. The cubic root of 51031100 is about 370.9183421099.

Adding to 51031100 its reverse (113015), we get a palindrome (51144115).

The spelling of 51031100 in words is "fifty-one million, thirty-one thousand, one hundred".