51440130 has 128 divisors (see below), whose sum is σ = 166095360. Its totient is φ = 11059200.

The previous prime is 51440111. The next prime is 51440149. The reversal of 51440130 is 3104415.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51440111) and next prime (51440149).

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 31330 + ... + 32930.

It is an arithmetic number, because the mean of its divisors is an integer number (1297620).

Almost surely, 2^51440130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51440130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83047680).

51440130 is an abundant number, since it is smaller than the sum of its proper divisors (114655230).

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

51440130 is a wasteful number, since it uses less digits than its factorization.

51440130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51440130 is about 7172.1774936207. The cubic root of 51440130 is about 371.9067143821.

Adding to 51440130 its reverse (3104415), we get a palindrome (54544545).

The spelling of 51440130 in words is "fifty-one million, four hundred forty thousand, one hundred thirty".