71088989 has 2 divisors, whose sum is σ = 71088990. Its totient is φ = 71088988.

The previous prime is 71088971. The next prime is 71089033. The reversal of 71088989 is 98988017.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42680089 + 28408900 = 6533^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 71088989 - 2⁸ = 71088733 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71088949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35544494 + 35544495.

It is an arithmetic number, because the mean of its divisors is an integer number (35544495).

Almost surely, 2^71088989 is an apocalyptic number.

It is an amenable number.

71088989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71088989 is an equidigital number, since it uses as much as digits as its factorization.

71088989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 71088989 is about 8431.4286452534. The cubic root of 71088989 is about 414.2547014155.

The spelling of 71088989 in words is "seventy-one million, eighty-eight thousand, nine hundred eighty-nine".