51340139 has 2 divisors, whose sum is σ = 51340140. Its totient is φ = 51340138.

The previous prime is 51340129. The next prime is 51340141. The reversal of 51340139 is 93104315.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51340139 is a prime.

Together with 51340141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51340129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25670069 + 25670070.

It is an arithmetic number, because the mean of its divisors is an integer number (25670070).

Almost surely, 2^51340139 is an apocalyptic number.

51340139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51340139 is an equidigital number, since it uses as much as digits as its factorization.

51340139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 51340139 is about 7165.2033467306. The cubic root of 51340139 is about 371.6655832805.

The spelling of 51340139 in words is "fifty-one million, three hundred forty thousand, one hundred thirty-nine".