51100113520 has 80 divisors (see below), whose sum is σ = 124460784000. Its totient is φ = 19485333504.

The previous prime is 51100113517. The next prime is 51100113523. The reversal of 51100113520 is 2531100115.

It is an interprime number because it is at equal distance from previous prime (51100113517) and next prime (51100113523).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×51100113520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51100113523) 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, 43876 + ... + 322684.

It is an arithmetic number, because the mean of its divisors is an integer number (1555759800).

Almost surely, 2^51100113520 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 51100113520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62230392000).

51100113520 is an abundant number, since it is smaller than the sum of its proper divisors (73360670480).

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

51100113520 is a wasteful number, since it uses less digits than its factorization.

51100113520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278930 (or 278924 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 19.

Adding to 51100113520 its reverse (2531100115), we get a palindrome (53631213635).

The spelling of 51100113520 in words is "fifty-one billion, one hundred million, one hundred thirteen thousand, five hundred twenty".