51451500 has 48 divisors (see below), whose sum is σ = 149831136. Its totient is φ = 13720000.

The previous prime is 51451493. The next prime is 51451501. The reversal of 51451500 is 515415.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51451501) 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 15 ways as a sum of consecutive naturals, for example, 15651 + ... + 18650.

It is an arithmetic number, because the mean of its divisors is an integer number (3121482).

Almost surely, 2^51451500 is an apocalyptic number.

51451500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51451500 is an abundant number, since it is smaller than the sum of its proper divisors (98379636).

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

51451500 is a wasteful number, since it uses less digits than its factorization.

51451500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34323 (or 34311 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51451500 is about 7172.9700961317. The cubic root of 51451500 is about 371.9341136637.

Adding to 51451500 its reverse (515415), we get a palindrome (51966915).

The spelling of 51451500 in words is "fifty-one million, four hundred fifty-one thousand, five hundred".