51220751 has 8 divisors (see below), whose sum is σ = 54343680. Its totient is φ = 48140568.

The previous prime is 51220739. The next prime is 51220759. The reversal of 51220751 is 15702215.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51220751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8201 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (6792960).

Almost surely, 2^51220751 is an apocalyptic number.

51220751 is a deficient number, since it is larger than the sum of its proper divisors (3122929).

51220751 is a wasteful number, since it uses less digits than its factorization.

51220751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21373.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 51220751 is about 7156.8674013146. The cubic root of 51220751 is about 371.3772653351.

Adding to 51220751 its reverse (15702215), we get a palindrome (66922966).

The spelling of 51220751 in words is "fifty-one million, two hundred twenty thousand, seven hundred fifty-one".