51223251 has 8 divisors (see below), whose sum is σ = 70652880. Its totient is φ = 32971232.

The previous prime is 51223247. The next prime is 51223301. The reversal of 51223251 is 15232215.

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 51223251 - 2² = 51223247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51223451) 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, 294300 + ... + 294473.

It is an arithmetic number, because the mean of its divisors is an integer number (8831610).

Almost surely, 2^51223251 is an apocalyptic number.

51223251 is a deficient number, since it is larger than the sum of its proper divisors (19429629).

51223251 is a wasteful number, since it uses less digits than its factorization.

51223251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588805.

The product of its digits is 600, while the sum is 21.

The square root of 51223251 is about 7157.0420566041. The cubic root of 51223251 is about 371.3833073399.

Adding to 51223251 its reverse (15232215), we get a palindrome (66455466).

The spelling of 51223251 in words is "fifty-one million, two hundred twenty-three thousand, two hundred fifty-one".