71383649 has 4 divisors (see below), whose sum is σ = 71811264. Its totient is φ = 70956036.

The previous prime is 71383601. The next prime is 71383657. The reversal of 71383649 is 94638317.

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 71383649 - 2⁸ = 71383393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71383679) 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, 213557 + ... + 213890.

It is an arithmetic number, because the mean of its divisors is an integer number (17952816).

Almost surely, 2^71383649 is an apocalyptic number.

It is an amenable number.

71383649 is a deficient number, since it is larger than the sum of its proper divisors (427615).

71383649 is a wasteful number, since it uses less digits than its factorization.

71383649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427614.

The product of its digits is 108864, while the sum is 41.

The square root of 71383649 is about 8448.8844825811. The cubic root of 71383649 is about 414.8262668547.

The spelling of 71383649 in words is "seventy-one million, three hundred eighty-three thousand, six hundred forty-nine".