51551471 has 4 divisors (see below), whose sum is σ = 52944792. Its totient is φ = 50158152.

The previous prime is 51551449. The next prime is 51551501. The reversal of 51551471 is 17415515.

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 51551471 - 2⁶ = 51551407 is a prime.

It is a super-3 number, since 3×51551471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551431) 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, 696605 + ... + 696678.

It is an arithmetic number, because the mean of its divisors is an integer number (13236198).

Almost surely, 2^51551471 is an apocalyptic number.

51551471 is a deficient number, since it is larger than the sum of its proper divisors (1393321).

51551471 is a wasteful number, since it uses less digits than its factorization.

51551471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393320.

The product of its digits is 3500, while the sum is 29.

The square root of 51551471 is about 7179.9353061152. The cubic root of 51551471 is about 372.1748489135.

Adding to 51551471 its reverse (17415515), we get a palindrome (68966986).

The spelling of 51551471 in words is "fifty-one million, five hundred fifty-one thousand, four hundred seventy-one".