71287189 has 4 divisors (see below), whose sum is σ = 74386656. Its totient is φ = 68187724.

The previous prime is 71287169. The next prime is 71287207. The reversal of 71287189 is 98178217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71287189 - 2⁵ = 71287157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71287159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1549699 + ... + 1549744.

It is an arithmetic number, because the mean of its divisors is an integer number (18596664).

Almost surely, 2^71287189 is an apocalyptic number.

It is an amenable number.

71287189 is a deficient number, since it is larger than the sum of its proper divisors (3099467).

71287189 is a wasteful number, since it uses less digits than its factorization.

71287189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099466.

The product of its digits is 56448, while the sum is 43.

The square root of 71287189 is about 8443.1741069340. The cubic root of 71287189 is about 414.6393324546.

The spelling of 71287189 in words is "seventy-one million, two hundred eighty-seven thousand, one hundred eighty-nine".