71284189 has 2 divisors, whose sum is σ = 71284190. Its totient is φ = 71284188.

The previous prime is 71284151. The next prime is 71284207. The reversal of 71284189 is 98148217.

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., 69856164 + 1428025 = 8358^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 71284189 - 2¹⁵ = 71251421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71284489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35642094 + 35642095.

It is an arithmetic number, because the mean of its divisors is an integer number (35642095).

Almost surely, 2^71284189 is an apocalyptic number.

It is an amenable number.

71284189 is a deficient number, since it is larger than the sum of its proper divisors (1).

71284189 is an equidigital number, since it uses as much as digits as its factorization.

71284189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 71284189 is about 8442.9964467599. The cubic root of 71284189 is about 414.6335159095.

The spelling of 71284189 in words is "seventy-one million, two hundred eighty-four thousand, one hundred eighty-nine".