51243751 has 8 divisors (see below), whose sum is σ = 55419840. Its totient is φ = 47101152.

The previous prime is 51243749. The next prime is 51243757. The reversal of 51243751 is 15734215.

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 not a de Polignac number, because 51243751 - 2¹ = 51243749 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 (51243757) 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, 5140 + ... + 11353.

It is an arithmetic number, because the mean of its divisors is an integer number (6927480).

Almost surely, 2^51243751 is an apocalyptic number.

51243751 is a deficient number, since it is larger than the sum of its proper divisors (4176089).

51243751 is a wasteful number, since it uses less digits than its factorization.

51243751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16745.

The product of its digits is 4200, while the sum is 28.

The square root of 51243751 is about 7158.4740692413. The cubic root of 51243751 is about 371.4328443648.

Adding to 51243751 its reverse (15734215), we get a palindrome (66977966).

The spelling of 51243751 in words is "fifty-one million, two hundred forty-three thousand, seven hundred fifty-one".