5439664891 has 4 divisors (see below), whose sum is σ = 5615137984. Its totient is φ = 5264191800.

The previous prime is 5439664883. The next prime is 5439664939. The reversal of 5439664891 is 1984669345.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1984669345 = 5 ⋅396933869.

It is a cyclic number.

It is not a de Polignac number, because 5439664891 - 2³ = 5439664883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5439664591) 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, 87736500 + ... + 87736561.

It is an arithmetic number, because the mean of its divisors is an integer number (1403784496).

Almost surely, 2^5439664891 is an apocalyptic number.

5439664891 is a deficient number, since it is larger than the sum of its proper divisors (175473093).

5439664891 is a wasteful number, since it uses less digits than its factorization.

5439664891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175473092.

The product of its digits is 5598720, while the sum is 55.

The square root of 5439664891 is about 73754.0838937072. The cubic root of 5439664891 is about 1758.6957549552.

The spelling of 5439664891 in words is "five billion, four hundred thirty-nine million, six hundred sixty-four thousand, eight hundred ninety-one".