51621152 has 48 divisors (see below), whose sum is σ = 113000832. Its totient is φ = 23013120.

The previous prime is 51621137. The next prime is 51621161. The reversal of 51621152 is 25112615.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17273 + ... + 20039.

It is an arithmetic number, because the mean of its divisors is an integer number (2354184).

Almost surely, 2^51621152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51621152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56500416).

51621152 is an abundant number, since it is smaller than the sum of its proper divisors (61379680).

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

51621152 is a wasteful number, since it uses less digits than its factorization.

51621152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841 (or 2833 counting only the distinct ones).

The product of its digits is 600, while the sum is 23.

The square root of 51621152 is about 7184.7861485224. The cubic root of 51621152 is about 372.3424602951.

Adding to 51621152 its reverse (25112615), we get a palindrome (76733767).

The spelling of 51621152 in words is "fifty-one million, six hundred twenty-one thousand, one hundred fifty-two".