51521244 has 12 divisors (see below), whose sum is σ = 120216264. Its totient is φ = 17173744.

The previous prime is 51521209. The next prime is 51521263. The reversal of 51521244 is 44212515.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2146707 + ... + 2146730.

It is an arithmetic number, because the mean of its divisors is an integer number (10018022).

Almost surely, 2^51521244 is an apocalyptic number.

It is an amenable number.

51521244 is an abundant number, since it is smaller than the sum of its proper divisors (68695020).

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

51521244 is a wasteful number, since it uses less digits than its factorization.

51521244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293444 (or 4293442 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 51521244 is about 7177.8300342095. The cubic root of 51521244 is about 372.1020936109.

Adding to 51521244 its reverse (44212515), we get a palindrome (95733759).

The spelling of 51521244 in words is "fifty-one million, five hundred twenty-one thousand, two hundred forty-four".