51140220 has 48 divisors (see below), whose sum is σ = 143730720. Its totient is φ = 13586176.

The previous prime is 51140213. The next prime is 51140231. The reversal of 51140220 is 2204115.

51140220 = T₈₉ + T₉₀ + ... + T₆₇₄.

51140220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51140220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16126 + ... + 19034.

It is an arithmetic number, because the mean of its divisors is an integer number (2994390).

Almost surely, 2^51140220 is an apocalyptic number.

It is an amenable number.

51140220 is an abundant number, since it is smaller than the sum of its proper divisors (92590500).

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

51140220 is a wasteful number, since it uses less digits than its factorization.

51140220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214 (or 3212 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 51140220 is about 7151.2390534788. The cubic root of 51140220 is about 371.1825326049.

Adding to 51140220 its reverse (2204115), we get a palindrome (53344335).

It can be divided in two parts, 51140 and 220, that added together give a triangular number (51360 = T₃₂₀).

The spelling of 51140220 in words is "fifty-one million, one hundred forty thousand, two hundred twenty".