51656477 has 12 divisors (see below), whose sum is σ = 53775540. Its totient is φ = 49614336.

The previous prime is 51656471. The next prime is 51656483. The reversal of 51656477 is 77465615.

51656477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51656471) and next prime (51656483).

It can be written as a sum of positive squares in 6 ways, for example, as 4239481 + 47416996 = 2059^2 + 6886^2 .

It is not a de Polignac number, because 51656477 - 2¹⁴ = 51640093 is a prime.

It is a Duffinian number.

Its product of digits (176400) is a multiple of the sum of its prime factors (560).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132599 + ... + 132987.

It is an arithmetic number, because the mean of its divisors is an integer number (4481295).

Almost surely, 2^51656477 is an apocalyptic number.

It is an amenable number.

51656477 is a deficient number, since it is larger than the sum of its proper divisors (2119063).

51656477 is an equidigital number, since it uses as much as digits as its factorization.

51656477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560 (or 523 counting only the distinct ones).

The product of its digits is 176400, while the sum is 41.

The square root of 51656477 is about 7187.2440476166. The cubic root of 51656477 is about 372.4273737965.

The spelling of 51656477 in words is "fifty-one million, six hundred fifty-six thousand, four hundred seventy-seven".