51151520 has 96 divisors (see below), whose sum is σ = 139708800. Its totient is φ = 17335296.

The previous prime is 51151493. The next prime is 51151523. The reversal of 51151520 is 2515115.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51151492 and 51151501.

It is not an unprimeable number, because it can be changed into a prime (51151523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121871 + ... + 122289.

It is an arithmetic number, because the mean of its divisors is an integer number (1455300).

Almost surely, 2^51151520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51151520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69854400).

51151520 is an abundant number, since it is smaller than the sum of its proper divisors (88557280).

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

51151520 is a wasteful number, since it uses less digits than its factorization.

51151520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51151520 is about 7152.0290827149. The cubic root of 51151520 is about 371.2098695602.

Adding to 51151520 its reverse (2515115), we get a palindrome (53666635).

The spelling of 51151520 in words is "fifty-one million, one hundred fifty-one thousand, five hundred twenty".