51213528 has 24 divisors (see below), whose sum is σ = 138703500. Its totient is φ = 17071152.

The previous prime is 51213523. The next prime is 51213583. The reversal of 51213528 is 82531215.

It is a happy number.

51213528 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355578 + ... + 355721.

Almost surely, 2^51213528 is an apocalyptic number.

It is an amenable number.

51213528 is an abundant number, since it is smaller than the sum of its proper divisors (87489972).

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

51213528 is a wasteful number, since it uses less digits than its factorization.

51213528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711311 (or 711304 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51213528 is about 7156.3627633037. The cubic root of 51213528 is about 371.3598076704.

It can be divided in two parts, 5121 and 3528, that added together give a square (8649 = 93²).

The spelling of 51213528 in words is "fifty-one million, two hundred thirteen thousand, five hundred twenty-eight".