51505253 has 8 divisors (see below), whose sum is σ = 52530816. Its totient is φ = 50490000.

The previous prime is 51505213. The next prime is 51505273. The reversal of 51505253 is 35250515.

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 51505253 - 2¹² = 51501157 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 (51505213) 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, 7928 + ... + 12878.

It is an arithmetic number, because the mean of its divisors is an integer number (6566352).

Almost surely, 2^51505253 is an apocalyptic number.

It is an amenable number.

51505253 is a deficient number, since it is larger than the sum of its proper divisors (1025563).

51505253 is a wasteful number, since it uses less digits than its factorization.

51505253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 51505253 is about 7176.7160317237. The cubic root of 51505253 is about 372.0635923388.

Adding to 51505253 its reverse (35250515), we get a palindrome (86755768).

The spelling of 51505253 in words is "fifty-one million, five hundred five thousand, two hundred fifty-three".