71819489 has 4 divisors (see below), whose sum is σ = 82079424. Its totient is φ = 61559556.

The previous prime is 71819477. The next prime is 71819491. The reversal of 71819489 is 98491817.

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 71819489 - 2⁸ = 71819233 is a prime.

It is a super-2 number, since 2×71819489² = 10316078000442242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71810489) 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, 5129957 + ... + 5129970.

It is an arithmetic number, because the mean of its divisors is an integer number (20519856).

Almost surely, 2^71819489 is an apocalyptic number.

It is an amenable number.

71819489 is a deficient number, since it is larger than the sum of its proper divisors (10259935).

71819489 is a wasteful number, since it uses less digits than its factorization.

71819489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10259934.

The product of its digits is 145152, while the sum is 47.

The square root of 71819489 is about 8474.6379863685. The cubic root of 71819489 is about 415.6688088369.

The spelling of 71819489 in words is "seventy-one million, eight hundred nineteen thousand, four hundred eighty-nine".