71725009 has 2 divisors, whose sum is σ = 71725010. Its totient is φ = 71725008.

The previous prime is 71724967. The next prime is 71725013. The reversal of 71725009 is 90052717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46444225 + 25280784 = 6815^2 + 5028^2 .

It is a cyclic number.

It is not a de Polignac number, because 71725009 - 2⁷ = 71724881 is a prime.

It is not a weakly prime, because it can be changed into another prime (71725039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35862504 + 35862505.

It is an arithmetic number, because the mean of its divisors is an integer number (35862505).

Almost surely, 2^71725009 is an apocalyptic number.

It is an amenable number.

71725009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71725009 is an equidigital number, since it uses as much as digits as its factorization.

71725009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 71725009 is about 8469.0618724862. The cubic root of 71725009 is about 415.4864552566.

The spelling of 71725009 in words is "seventy-one million, seven hundred twenty-five thousand, nine".