51451320 has 64 divisors (see below), whose sum is σ = 159344640. Its totient is φ = 13276800.

The previous prime is 51451313. The next prime is 51451327. The reversal of 51451320 is 2315415.

It is an interprime number because it is at equal distance from previous prime (51451313) and next prime (51451327).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51451327) 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, 3196 + ... + 10635.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^51451320 is an apocalyptic number.

It is an amenable number.

51451320 is an abundant number, since it is smaller than the sum of its proper divisors (107893320).

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

51451320 is a wasteful number, since it uses less digits than its factorization.

51451320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13876 (or 13872 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51451320 is about 7172.9575490170. The cubic root of 51451320 is about 371.9336799335.

Adding to 51451320 its reverse (2315415), we get a palindrome (53766735).

The spelling of 51451320 in words is "fifty-one million, four hundred fifty-one thousand, three hundred twenty".