51471139 has 2 divisors, whose sum is σ = 51471140. Its totient is φ = 51471138.

The previous prime is 51471137. The next prime is 51471169. The reversal of 51471139 is 93117415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51471139 - 2¹ = 51471137 is a prime.

Together with 51471137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51471139.

It is not a weakly prime, because it can be changed into another prime (51471131) by changing a digit.

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 as a sum of consecutive naturals, namely, 25735569 + 25735570.

It is an arithmetic number, because the mean of its divisors is an integer number (25735570).

Almost surely, 2^51471139 is an apocalyptic number.

51471139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51471139 is an equidigital number, since it uses as much as digits as its factorization.

51471139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 51471139 is about 7174.3389242494. The cubic root of 51471139 is about 371.9814299706.

The spelling of 51471139 in words is "fifty-one million, four hundred seventy-one thousand, one hundred thirty-nine".