51327139 has 2 divisors, whose sum is σ = 51327140. Its totient is φ = 51327138.

The previous prime is 51327127. The next prime is 51327163. The reversal of 51327139 is 93172315.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51327139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51327139.

It is not a weakly prime, because it can be changed into another prime (51327439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25663569 + 25663570.

It is an arithmetic number, because the mean of its divisors is an integer number (25663570).

Almost surely, 2^51327139 is an apocalyptic number.

51327139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51327139 is an equidigital number, since it uses as much as digits as its factorization.

51327139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 51327139 is about 7164.2961273247. The cubic root of 51327139 is about 371.6342104239.

The spelling of 51327139 in words is "fifty-one million, three hundred twenty-seven thousand, one hundred thirty-nine".