51309552 has 80 divisors (see below), whose sum is σ = 153482240. Its totient is φ = 14466816.

The previous prime is 51309547. The next prime is 51309593. The reversal of 51309552 is 25590315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25578 + ... + 27510.

It is an arithmetic number, because the mean of its divisors is an integer number (1918528).

Almost surely, 2^51309552 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 51309552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76741120).

51309552 is an abundant number, since it is smaller than the sum of its proper divisors (102172688).

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

51309552 is a wasteful number, since it uses less digits than its factorization.

51309552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030 (or 2024 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 51309552 is about 7163.0686161728. The cubic root of 51309552 is about 371.5917593436.

Adding to 51309552 its reverse (25590315), we get a palindrome (76899867).

The spelling of 51309552 in words is "fifty-one million, three hundred nine thousand, five hundred fifty-two".