71651009 has 2 divisors, whose sum is σ = 71651010. Its totient is φ = 71651008.

The previous prime is 71650993. The next prime is 71651017. The reversal of 71651009 is 90015617.

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., 56851600 + 14799409 = 7540^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 71651009 - 2⁴ = 71650993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71651059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35825504 + 35825505.

It is an arithmetic number, because the mean of its divisors is an integer number (35825505).

Almost surely, 2^71651009 is an apocalyptic number.

It is an amenable number.

71651009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71651009 is an equidigital number, since it uses as much as digits as its factorization.

71651009 is an odious number, because the sum of its binary digits is odd.

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

The square root of 71651009 is about 8464.6919022490. The cubic root of 71651009 is about 415.3435177702.

The spelling of 71651009 in words is "seventy-one million, six hundred fifty-one thousand, nine".