71980709 has 2 divisors, whose sum is σ = 71980710. Its totient is φ = 71980708.

The previous prime is 71980681. The next prime is 71980739. The reversal of 71980709 is 90708917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 1050625 = 8422^2 + 1025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71980709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71980739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35990354 + 35990355.

It is an arithmetic number, because the mean of its divisors is an integer number (35990355).

Almost surely, 2^71980709 is an apocalyptic number.

It is an amenable number.

71980709 is a deficient number, since it is larger than the sum of its proper divisors (1).

71980709 is an equidigital number, since it uses as much as digits as its factorization.

71980709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 71980709 is about 8484.1445650107. The cubic root of 71980709 is about 415.9796067573.

The spelling of 71980709 in words is "seventy-one million, nine hundred eighty thousand, seven hundred nine".