51521230 has 16 divisors (see below), whose sum is σ = 93130560. Its totient is φ = 20521312.

The previous prime is 51521209. The next prime is 51521263. The reversal of 51521230 is 3212515.

It is a junction number, because it is equal to n+sod(n) for n = 51521198 and 51521207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8389 + ... + 13168.

It is an arithmetic number, because the mean of its divisors is an integer number (5820660).

Almost surely, 2^51521230 is an apocalyptic number.

51521230 is a deficient number, since it is larger than the sum of its proper divisors (41609330).

51521230 is a wasteful number, since it uses less digits than its factorization.

51521230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21803.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 51521230 is about 7177.8290589843. The cubic root of 51521230 is about 372.1020599068.

Adding to 51521230 its reverse (3212515), we get a palindrome (54733745).

The spelling of 51521230 in words is "fifty-one million, five hundred twenty-one thousand, two hundred thirty".