51320551 has 4 divisors (see below), whose sum is σ = 51550912. Its totient is φ = 51090192.

The previous prime is 51320527. The next prime is 51320597. The reversal of 51320551 is 15502315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15502315 = 5 ⋅3100463.

It is not a de Polignac number, because 51320551 - 2⁵ = 51320519 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 (51320351) 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, 114846 + ... + 115291.

It is an arithmetic number, because the mean of its divisors is an integer number (12887728).

Almost surely, 2^51320551 is an apocalyptic number.

51320551 is a deficient number, since it is larger than the sum of its proper divisors (230361).

51320551 is a wasteful number, since it uses less digits than its factorization.

51320551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230360.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51320551 is about 7163.8363325805. The cubic root of 51320551 is about 371.6183096030.

Adding to 51320551 its reverse (15502315), we get a palindrome (66822866).

The spelling of 51320551 in words is "fifty-one million, three hundred twenty thousand, five hundred fifty-one".