51220253 has 4 divisors (see below), whose sum is σ = 58537440. Its totient is φ = 43903068.

The previous prime is 51220223. The next prime is 51220291. The reversal of 51220253 is 35202215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35202215 = 5 ⋅7040443.

It is a cyclic number.

It is not a de Polignac number, because 51220253 - 2²² = 47025949 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 (51220223) 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, 3658583 + ... + 3658596.

It is an arithmetic number, because the mean of its divisors is an integer number (14634360).

Almost surely, 2^51220253 is an apocalyptic number.

It is an amenable number.

51220253 is a deficient number, since it is larger than the sum of its proper divisors (7317187).

51220253 is an equidigital number, since it uses as much as digits as its factorization.

51220253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7317186.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51220253 is about 7156.8326094719. The cubic root of 51220253 is about 371.3760617443.

Adding to 51220253 its reverse (35202215), we get a palindrome (86422468).

The spelling of 51220253 in words is "fifty-one million, two hundred twenty thousand, two hundred fifty-three".