51686471 has 2 divisors, whose sum is σ = 51686472. Its totient is φ = 51686470.

The previous prime is 51686431. The next prime is 51686489. The reversal of 51686471 is 17468615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51686471 - 2¹⁸ = 51424327 is a prime.

It is a super-3 number, since 3×51686471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51686431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25843235 + 25843236.

It is an arithmetic number, because the mean of its divisors is an integer number (25843236).

Almost surely, 2^51686471 is an apocalyptic number.

51686471 is a deficient number, since it is larger than the sum of its proper divisors (1).

51686471 is an equidigital number, since it uses as much as digits as its factorization.

51686471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 51686471 is about 7189.3303582462. The cubic root of 51686471 is about 372.4994423666.

The spelling of 51686471 in words is "fifty-one million, six hundred eighty-six thousand, four hundred seventy-one".