51231100 has 18 divisors (see below), whose sum is σ = 111171704. Its totient is φ = 20492400.

The previous prime is 51231083. The next prime is 51231101. The reversal of 51231100 is 113215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51231101) 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, 256056 + ... + 256255.

Almost surely, 2^51231100 is an apocalyptic number.

51231100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51231100 is an abundant number, since it is smaller than the sum of its proper divisors (59940604).

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

51231100 is a wasteful number, since it uses less digits than its factorization.

51231100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512325 (or 512318 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 51231100 is about 7157.5903766561. The cubic root of 51231100 is about 371.4022755405.

Adding to 51231100 its reverse (113215), we get a palindrome (51344315).

The spelling of 51231100 in words is "fifty-one million, two hundred thirty-one thousand, one hundred".