51231251 has 8 divisors (see below), whose sum is σ = 55995264. Its totient is φ = 46661760.

The previous prime is 51231247. The next prime is 51231259. The reversal of 51231251 is 15213215.

It is a happy number.

51231251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51231251 - 2² = 51231247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51231259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48080 + ... + 49133.

It is an arithmetic number, because the mean of its divisors is an integer number (6999408).

Almost surely, 2^51231251 is an apocalyptic number.

51231251 is a deficient number, since it is larger than the sum of its proper divisors (4764013).

51231251 is a wasteful number, since it uses less digits than its factorization.

51231251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97261.

The product of its digits is 300, while the sum is 20.

The square root of 51231251 is about 7157.6009248910. The cubic root of 51231251 is about 371.4026404340.

Adding to 51231251 its reverse (15213215), we get a palindrome (66444466).

The spelling of 51231251 in words is "fifty-one million, two hundred thirty-one thousand, two hundred fifty-one".