71800139 has 2 divisors, whose sum is σ = 71800140. Its totient is φ = 71800138.

The previous prime is 71800121. The next prime is 71800151. The reversal of 71800139 is 93100817.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71800139 - 2⁸ = 71799883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (71800159) 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 as a sum of consecutive naturals, namely, 35900069 + 35900070.

It is an arithmetic number, because the mean of its divisors is an integer number (35900070).

Almost surely, 2^71800139 is an apocalyptic number.

71800139 is a deficient number, since it is larger than the sum of its proper divisors (1).

71800139 is an equidigital number, since it uses as much as digits as its factorization.

71800139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 71800139 is about 8473.4962677752. The cubic root of 71800139 is about 415.6314748949.

The spelling of 71800139 in words is "seventy-one million, eight hundred thousand, one hundred thirty-nine".