51505471 has 4 divisors (see below), whose sum is σ = 52761744. Its totient is φ = 50249200.

The previous prime is 51505423. The next prime is 51505481. The reversal of 51505471 is 17450515.

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 51505471 - 2⁷ = 51505343 is a prime.

It is a super-3 number, since 3×51505471³ (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 (51505481) 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, 628075 + ... + 628156.

It is an arithmetic number, because the mean of its divisors is an integer number (13190436).

Almost surely, 2^51505471 is an apocalyptic number.

51505471 is a deficient number, since it is larger than the sum of its proper divisors (1256273).

51505471 is a wasteful number, since it uses less digits than its factorization.

51505471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256272.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 51505471 is about 7176.7312197128. The cubic root of 51505471 is about 372.0641172675.

Adding to 51505471 its reverse (17450515), we get a palindrome (68955986).

The spelling of 51505471 in words is "fifty-one million, five hundred five thousand, four hundred seventy-one".