51561230 has 24 divisors (see below), whose sum is σ = 107963928. Its totient is φ = 17677968.

The previous prime is 51561203. The next prime is 51561233. The reversal of 51561230 is 3216515.

It is a super-2 number, since 2×51561230² = 5317120878225800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51561196 and 51561205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52124 + ... + 53103.

It is an arithmetic number, because the mean of its divisors is an integer number (4498497).

Almost surely, 2^51561230 is an apocalyptic number.

51561230 is an abundant number, since it is smaller than the sum of its proper divisors (56402698).

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

51561230 is a wasteful number, since it uses less digits than its factorization.

51561230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105248 (or 105241 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51561230 is about 7180.6148761788. The cubic root of 51561230 is about 372.1983324024.

Adding to 51561230 its reverse (3216515), we get a palindrome (54777745).

The spelling of 51561230 in words is "fifty-one million, five hundred sixty-one thousand, two hundred thirty".