71156009 has 2 divisors, whose sum is σ = 71156010. Its totient is φ = 71156008.

The previous prime is 71155991. The next prime is 71156017. The reversal of 71156009 is 90065117.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 9486400 = 7853^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 71156009 - 2⁸ = 71155753 is a prime.

It is not a weakly prime, because it can be changed into another prime (71156609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35578004 + 35578005.

It is an arithmetic number, because the mean of its divisors is an integer number (35578005).

Almost surely, 2^71156009 is an apocalyptic number.

It is an amenable number.

71156009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71156009 is an equidigital number, since it uses as much as digits as its factorization.

71156009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 71156009 is about 8435.4021243803. The cubic root of 71156009 is about 414.3848417289.

The spelling of 71156009 in words is "seventy-one million, one hundred fifty-six thousand, nine".