71339989 has 4 divisors (see below), whose sum is σ = 81531424. Its totient is φ = 61148556.

The previous prime is 71339977. The next prime is 71340001. The reversal of 71339989 is 98993317.

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 (71339977) and next prime (71340001).

It is not a de Polignac number, because 71339989 - 2⁷ = 71339861 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 (71339929) 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, 5095707 + ... + 5095720.

It is an arithmetic number, because the mean of its divisors is an integer number (20382856).

Almost surely, 2^71339989 is an apocalyptic number.

It is an amenable number.

71339989 is a deficient number, since it is larger than the sum of its proper divisors (10191435).

71339989 is a wasteful number, since it uses less digits than its factorization.

71339989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10191434.

The product of its digits is 367416, while the sum is 49.

The square root of 71339989 is about 8446.3003143388. The cubic root of 71339989 is about 414.7416769486.

The spelling of 71339989 in words is "seventy-one million, three hundred thirty-nine thousand, nine hundred eighty-nine".