51125520 has 40 divisors (see below), whose sum is σ = 158489856. Its totient is φ = 13633408.

The previous prime is 51125497. The next prime is 51125533. The reversal of 51125520 is 2552115.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51125520² = 5227637590540800, which contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106272 + ... + 106751.

Almost surely, 2^51125520 is an apocalyptic number.

It is an amenable number.

51125520 is an abundant number, since it is smaller than the sum of its proper divisors (107364336).

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

51125520 is a wasteful number, since it uses less digits than its factorization.

51125520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213039 (or 213033 counting only the distinct ones).

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

The square root of 51125520 is about 7150.2111856923. The cubic root of 51125520 is about 371.1469643437.

Adding to 51125520 its reverse (2552115), we get a palindrome (53677635).

The spelling of 51125520 in words is "fifty-one million, one hundred twenty-five thousand, five hundred twenty".