71220827 has 2 divisors, whose sum is σ = 71220828. Its totient is φ = 71220826.

The previous prime is 71220823. The next prime is 71220833. The reversal of 71220827 is 72802217.

It is a weak prime.

It is an emirp because it is prime and its reverse (72802217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71220827 - 2² = 71220823 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71220827.

It is not a weakly prime, because it can be changed into another prime (71220823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35610413 + 35610414.

It is an arithmetic number, because the mean of its divisors is an integer number (35610414).

Almost surely, 2^71220827 is an apocalyptic number.

71220827 is a deficient number, since it is larger than the sum of its proper divisors (1).

71220827 is an equidigital number, since it uses as much as digits as its factorization.

71220827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 71220827 is about 8439.2432717632. The cubic root of 71220827 is about 414.5106284589.

The spelling of 71220827 in words is "seventy-one million, two hundred twenty thousand, eight hundred twenty-seven".