71709397 has 2 divisors, whose sum is σ = 71709398. Its totient is φ = 71709396.

The previous prime is 71709389. The next prime is 71709409. The reversal of 71709397 is 79390717.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68046001 + 3663396 = 8249^2 + 1914^2 .

It is a cyclic number.

It is not a de Polignac number, because 71709397 - 2³ = 71709389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71709307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35854698 + 35854699.

It is an arithmetic number, because the mean of its divisors is an integer number (35854699).

Almost surely, 2^71709397 is an apocalyptic number.

It is an amenable number.

71709397 is a deficient number, since it is larger than the sum of its proper divisors (1).

71709397 is an equidigital number, since it uses as much as digits as its factorization.

71709397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83349, while the sum is 43.

The square root of 71709397 is about 8468.1401145706. The cubic root of 71709397 is about 415.4563074958.

The spelling of 71709397 in words is "seventy-one million, seven hundred nine thousand, three hundred ninety-seven".