51100140 has 192 divisors, whose sum is σ = 180633600. Its totient is φ = 10725120.

The previous prime is 51100057. The next prime is 51100157. The reversal of 51100140 is 4100115.

It is a happy number.

It is a super-2 number, since 2×51100140² = 5222448616039200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 267445 + ... + 267635.

It is an arithmetic number, because the mean of its divisors is an integer number (940800).

Almost surely, 2^51100140 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 51100140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90316800).

51100140 is an abundant number, since it is smaller than the sum of its proper divisors (129533460).

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

51100140 is a wasteful number, since it uses less digits than its factorization.

51100140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 51100140 is about 7148.4361926228. The cubic root of 51100140 is about 371.0855386009.

Adding to 51100140 its reverse (4100115), we get a palindrome (55200255).

The spelling of 51100140 in words is "fifty-one million, one hundred thousand, one hundred forty".