51254251 has 4 divisors (see below), whose sum is σ = 51386400. Its totient is φ = 51122104.

The previous prime is 51254239. The next prime is 51254257. The reversal of 51254251 is 15245215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51254251 - 2⁷ = 51254123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51254257) 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, 65491 + ... + 66268.

It is an arithmetic number, because the mean of its divisors is an integer number (12846600).

Almost surely, 2^51254251 is an apocalyptic number.

51254251 is a deficient number, since it is larger than the sum of its proper divisors (132149).

51254251 is a wasteful number, since it uses less digits than its factorization.

51254251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132148.

The product of its digits is 2000, while the sum is 25.

The square root of 51254251 is about 7159.2074282004. The cubic root of 51254251 is about 371.4582118710.

Adding to 51254251 its reverse (15245215), we get a palindrome (66499466).

The spelling of 51254251 in words is "fifty-one million, two hundred fifty-four thousand, two hundred fifty-one".