51100520 has 32 divisors (see below), whose sum is σ = 115213320. Its totient is φ = 20398080.

The previous prime is 51100501. The next prime is 51100529. The reversal of 51100520 is 2500115.

It can be written as a sum of positive squares in 4 ways, for example, as 50495236 + 605284 = 7106^2 + 778^2 .

It is a super-2 number, since 2×51100520² = 5222526288540800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51100495 and 51100504.

It is not an unprimeable number, because it can be changed into a prime (51100529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24644 + ... + 26636.

Almost surely, 2^51100520 is an apocalyptic number.

It is an amenable number.

51100520 is an abundant number, since it is smaller than the sum of its proper divisors (64112800).

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

51100520 is a wasteful number, since it uses less digits than its factorization.

51100520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645 (or 2641 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 51100520 is about 7148.4627718133. The cubic root of 51100520 is about 371.0864584429.

Adding to 51100520 its reverse (2500115), we get a palindrome (53600635).

The spelling of 51100520 in words is "fifty-one million, one hundred thousand, five hundred twenty".