51432251 has 4 divisors (see below), whose sum is σ = 55388592. Its totient is φ = 47475912.

The previous prime is 51432233. The next prime is 51432263. The reversal of 51432251 is 15223415.

51432251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51432251 - 2²² = 47237947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51432281) 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 3 ways as a sum of consecutive naturals, for example, 1978151 + ... + 1978176.

It is an arithmetic number, because the mean of its divisors is an integer number (13847148).

Almost surely, 2^51432251 is an apocalyptic number.

51432251 is a deficient number, since it is larger than the sum of its proper divisors (3956341).

51432251 is a wasteful number, since it uses less digits than its factorization.

51432251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956340.

The product of its digits is 1200, while the sum is 23.

The square root of 51432251 is about 7171.6281972785. The cubic root of 51432251 is about 371.8877252995.

Adding to 51432251 its reverse (15223415), we get a palindrome (66655666).

The spelling of 51432251 in words is "fifty-one million, four hundred thirty-two thousand, two hundred fifty-one".