71223917 has 2 divisors, whose sum is σ = 71223918. Its totient is φ = 71223916.

The previous prime is 71223883. The next prime is 71223961. The reversal of 71223917 is 71932217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69322276 + 1901641 = 8326^2 + 1379^2 .

It is a cyclic number.

It is not a de Polignac number, because 71223917 - 2¹² = 71219821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71223967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35611958 + 35611959.

It is an arithmetic number, because the mean of its divisors is an integer number (35611959).

Almost surely, 2^71223917 is an apocalyptic number.

It is an amenable number.

71223917 is a deficient number, since it is larger than the sum of its proper divisors (1).

71223917 is an equidigital number, since it uses as much as digits as its factorization.

71223917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 32.

The square root of 71223917 is about 8439.4263430638. The cubic root of 71223917 is about 414.5166230505.

The spelling of 71223917 in words is "seventy-one million, two hundred twenty-three thousand, nine hundred seventeen".