71899739 has 2 divisors, whose sum is σ = 71899740. Its totient is φ = 71899738.

The previous prime is 71899697. The next prime is 71899759. The reversal of 71899739 is 93799817.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71899739 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71899759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35949869 + 35949870.

It is an arithmetic number, because the mean of its divisors is an integer number (35949870).

Almost surely, 2^71899739 is an apocalyptic number.

71899739 is a deficient number, since it is larger than the sum of its proper divisors (1).

71899739 is an equidigital number, since it uses as much as digits as its factorization.

71899739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 53.

The square root of 71899739 is about 8479.3713800022. The cubic root of 71899739 is about 415.8235718672.

The spelling of 71899739 in words is "seventy-one million, eight hundred ninety-nine thousand, seven hundred thirty-nine".