71489009 has 2 divisors, whose sum is σ = 71489010. Its totient is φ = 71489008.

The previous prime is 71488999. The next prime is 71489017. The reversal of 71489009 is 90098417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66471409 + 5017600 = 8153^2 + 2240^2 .

It is an emirp because it is prime and its reverse (90098417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71489009 - 2²⁴ = 54711793 is a prime.

It is a super-2 number, since 2×71489009² = 10221356815604162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71489059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35744504 + 35744505.

It is an arithmetic number, because the mean of its divisors is an integer number (35744505).

Almost surely, 2^71489009 is an apocalyptic number.

It is an amenable number.

71489009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71489009 is an equidigital number, since it uses as much as digits as its factorization.

71489009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 71489009 is about 8455.1173262114. The cubic root of 71489009 is about 415.0302566608.

The spelling of 71489009 in words is "seventy-one million, four hundred eighty-nine thousand, nine".