71224009 has 2 divisors, whose sum is σ = 71224010. Its totient is φ = 71224008.

The previous prime is 71223967. The next prime is 71224051. The reversal of 71224009 is 90042217.

It is a balanced prime because it is at equal distance from previous prime (71223967) and next prime (71224051).

It can be written as a sum of positive squares in only one way, i.e., 36966400 + 34257609 = 6080^2 + 5853^2 .

It is a cyclic number.

It is not a de Polignac number, because 71224009 - 2⁹ = 71223497 is a prime.

It is not a weakly prime, because it can be changed into another prime (71224079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35612004 + 35612005.

It is an arithmetic number, because the mean of its divisors is an integer number (35612005).

Almost surely, 2^71224009 is an apocalyptic number.

It is an amenable number.

71224009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71224009 is an equidigital number, since it uses as much as digits as its factorization.

71224009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 71224009 is about 8439.4317936695. The cubic root of 71224009 is about 414.5168015276.

The spelling of 71224009 in words is "seventy-one million, two hundred twenty-four thousand, nine".