51253230 has 64 divisors (see below), whose sum is σ = 145133568. Its totient is φ = 11335680.

The previous prime is 51253219. The next prime is 51253271. The reversal of 51253230 is 3235215.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51253197 and 51253206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2574 + ... + 10446.

It is an arithmetic number, because the mean of its divisors is an integer number (2267712).

Almost surely, 2^51253230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51253230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72566784).

51253230 is an abundant number, since it is smaller than the sum of its proper divisors (93880338).

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

51253230 is a wasteful number, since it uses less digits than its factorization.

51253230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 51253230 is about 7159.1361210694. The cubic root of 51253230 is about 371.4557453351.

Adding to 51253230 its reverse (3235215), we get a palindrome (54488445).

The spelling of 51253230 in words is "fifty-one million, two hundred fifty-three thousand, two hundred thirty".