51471405 has 12 divisors (see below), whose sum is σ = 89217180. Its totient is φ = 27451392.

The previous prime is 51471397. The next prime is 51471421. The reversal of 51471405 is 50417415.

It is a happy number.

51471405 is a `hidden beast` number, since 514 + 7 + 140 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27910089 + 23561316 = 5283^2 + 4854^2 .

It is not a de Polignac number, because 51471405 - 2³ = 51471397 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 571860 + ... + 571949.

It is an arithmetic number, because the mean of its divisors is an integer number (7434765).

Almost surely, 2^51471405 is an apocalyptic number.

It is an amenable number.

51471405 is a deficient number, since it is larger than the sum of its proper divisors (37745775).

51471405 is a wasteful number, since it uses less digits than its factorization.

51471405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143820 (or 1143817 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 51471405 is about 7174.3574625189. The cubic root of 51471405 is about 371.9820707627.

The spelling of 51471405 in words is "fifty-one million, four hundred seventy-one thousand, four hundred five".