71751689 has 2 divisors, whose sum is σ = 71751690. Its totient is φ = 71751688.

The previous prime is 71751643. The next prime is 71751703. The reversal of 71751689 is 98615717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62141689 + 9610000 = 7883^2 + 3100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71751689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71751629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35875844 + 35875845.

It is an arithmetic number, because the mean of its divisors is an integer number (35875845).

Almost surely, 2^71751689 is an apocalyptic number.

It is an amenable number.

71751689 is a deficient number, since it is larger than the sum of its proper divisors (1).

71751689 is an equidigital number, since it uses as much as digits as its factorization.

71751689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 71751689 is about 8470.6368709797. The cubic root of 71751689 is about 415.5379659016.

The spelling of 71751689 in words is "seventy-one million, seven hundred fifty-one thousand, six hundred eighty-nine".