71030389 has 2 divisors, whose sum is σ = 71030390. Its totient is φ = 71030388.

The previous prime is 71030381. The next prime is 71030423. The reversal of 71030389 is 98303017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63329764 + 7700625 = 7958^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 71030389 - 2³ = 71030381 is a prime.

It is a super-2 number, since 2×71030389² = 10090632322982642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71030389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71030381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35515194 + 35515195.

It is an arithmetic number, because the mean of its divisors is an integer number (35515195).

Almost surely, 2^71030389 is an apocalyptic number.

It is an amenable number.

71030389 is a deficient number, since it is larger than the sum of its proper divisors (1).

71030389 is an equidigital number, since it uses as much as digits as its factorization.

71030389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 71030389 is about 8427.9528356535. The cubic root of 71030389 is about 414.1408441262.

The spelling of 71030389 in words is "seventy-one million, thirty thousand, three hundred eighty-nine".