51911500 has 48 divisors (see below), whose sum is σ = 115839360. Its totient is φ = 20322800.

The previous prime is 51911491. The next prime is 51911521. The reversal of 51911500 is 511915.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1104477 + ... + 1104523.

It is an arithmetic number, because the mean of its divisors is an integer number (2413320).

Almost surely, 2^51911500 is an apocalyptic number.

51911500 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 51911500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57919680).

51911500 is an abundant number, since it is smaller than the sum of its proper divisors (63927860).

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

51911500 is an frugal number, since it uses more digits than its factorization.

51911500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 51911500 is about 7204.9635668753. The cubic root of 51911500 is about 373.0392472125.

The spelling of 51911500 in words is "fifty-one million, nine hundred eleven thousand, five hundred".