71722691 has 2 divisors, whose sum is σ = 71722692. Its totient is φ = 71722690.

The previous prime is 71722661. The next prime is 71722723. The reversal of 71722691 is 19622717.

It is a weak prime.

It is an emirp because it is prime and its reverse (19622717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71722691 - 2¹⁴ = 71706307 is a prime.

It is not a weakly prime, because it can be changed into another prime (71722661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35861345 + 35861346.

It is an arithmetic number, because the mean of its divisors is an integer number (35861346).

Almost surely, 2^71722691 is an apocalyptic number.

71722691 is a deficient number, since it is larger than the sum of its proper divisors (1).

71722691 is an equidigital number, since it uses as much as digits as its factorization.

71722691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 71722691 is about 8468.9250203317. The cubic root of 71722691 is about 415.4819793283.

The spelling of 71722691 in words is "seventy-one million, seven hundred twenty-two thousand, six hundred ninety-one".