71221567 has 2 divisors, whose sum is σ = 71221568. Its totient is φ = 71221566.

The previous prime is 71221541. The next prime is 71221583. The reversal of 71221567 is 76512217.

It is a strong prime.

It is an emirp because it is prime and its reverse (76512217) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71221567 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 (71228567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35610783 + 35610784.

It is an arithmetic number, because the mean of its divisors is an integer number (35610784).

Almost surely, 2^71221567 is an apocalyptic number.

71221567 is a deficient number, since it is larger than the sum of its proper divisors (1).

71221567 is an equidigital number, since it uses as much as digits as its factorization.

71221567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 31.

The square root of 71221567 is about 8439.2871144428. The cubic root of 71221567 is about 414.5120640727.

The spelling of 71221567 in words is "seventy-one million, two hundred twenty-one thousand, five hundred sixty-seven".