51478461 has 6 divisors (see below), whose sum is σ = 74357790. Its totient is φ = 34318968.

The previous prime is 51478459. The next prime is 51478477. The reversal of 51478461 is 16487415.

It is a happy number.

51478461 is a `hidden beast` number, since 514 + 7 + 84 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44156025 + 7322436 = 6645^2 + 2706^2 .

It is not a de Polignac number, because 51478461 - 2¹ = 51478459 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51478421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2859906 + ... + 2859923.

It is an arithmetic number, because the mean of its divisors is an integer number (12392965).

Almost surely, 2^51478461 is an apocalyptic number.

It is an amenable number.

51478461 is a deficient number, since it is larger than the sum of its proper divisors (22879329).

51478461 is a wasteful number, since it uses less digits than its factorization.

51478461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5719835 (or 5719832 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 51478461 is about 7174.8491970215. The cubic root of 51478461 is about 371.9990678090. Note that the first 3 decimals are identical.

The spelling of 51478461 in words is "fifty-one million, four hundred seventy-eight thousand, four hundred sixty-one".