51220451 has 4 divisors (see below), whose sum is σ = 51236712. Its totient is φ = 51204192.

The previous prime is 51220427. The next prime is 51220457. The reversal of 51220451 is 15402215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15402215 = 5 ⋅3080443.

It is a cyclic number.

It is not a de Polignac number, because 51220451 - 2¹⁴ = 51204067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51220457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1721 + ... + 10266.

It is an arithmetic number, because the mean of its divisors is an integer number (12809178).

Almost surely, 2^51220451 is an apocalyptic number.

51220451 is a deficient number, since it is larger than the sum of its proper divisors (16261).

51220451 is a wasteful number, since it uses less digits than its factorization.

51220451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16260.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51220451 is about 7156.8464423935. The cubic root of 51220451 is about 371.3765402814.

Adding to 51220451 its reverse (15402215), we get a palindrome (66622666).

The spelling of 51220451 in words is "fifty-one million, two hundred twenty thousand, four hundred fifty-one".