71047139 has 2 divisors, whose sum is σ = 71047140. Its totient is φ = 71047138.

The previous prime is 71047117. The next prime is 71047147. The reversal of 71047139 is 93174017.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71047139 is a prime.

It is not a weakly prime, because it can be changed into another prime (71047159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35523569 + 35523570.

It is an arithmetic number, because the mean of its divisors is an integer number (35523570).

Almost surely, 2^71047139 is an apocalyptic number.

71047139 is a deficient number, since it is larger than the sum of its proper divisors (1).

71047139 is an equidigital number, since it uses as much as digits as its factorization.

71047139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 71047139 is about 8428.9464940762. The cubic root of 71047139 is about 414.1733950481.

The spelling of 71047139 in words is "seventy-one million, forty-seven thousand, one hundred thirty-nine".