71315989 has 4 divisors (see below), whose sum is σ = 71478880. Its totient is φ = 71153100.

The previous prime is 71315977. The next prime is 71316001. The reversal of 71315989 is 98951317.

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 an interprime number because it is at equal distance from previous prime (71315977) and next prime (71316001).

It is a cyclic number.

It is not a de Polignac number, because 71315989 - 2⁵ = 71315957 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 (71315929) 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, 80787 + ... + 81664.

It is an arithmetic number, because the mean of its divisors is an integer number (17869720).

Almost surely, 2^71315989 is an apocalyptic number.

It is an amenable number.

71315989 is a deficient number, since it is larger than the sum of its proper divisors (162891).

71315989 is a wasteful number, since it uses less digits than its factorization.

71315989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162890.

The product of its digits is 68040, while the sum is 43.

The square root of 71315989 is about 8444.8794544386. The cubic root of 71315989 is about 414.6951629863.

The spelling of 71315989 in words is "seventy-one million, three hundred fifteen thousand, nine hundred eighty-nine".