5945989991 has 4 divisors (see below), whose sum is σ = 6084268872. Its totient is φ = 5807711112.

The previous prime is 5945989981. The next prime is 5945990009. The reversal of 5945989991 is 1999895495.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5945989991 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 (5945989981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69139376 + ... + 69139461.

It is an arithmetic number, because the mean of its divisors is an integer number (1521067218).

Almost surely, 2^5945989991 is an apocalyptic number.

5945989991 is a deficient number, since it is larger than the sum of its proper divisors (138278881).

5945989991 is a wasteful number, since it uses less digits than its factorization.

5945989991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138278880.

The product of its digits is 47239200, while the sum is 68.

The square root of 5945989991 is about 77110.2456940710. The cubic root of 5945989991 is about 1811.6517781751.

The spelling of 5945989991 in words is "five billion, nine hundred forty-five million, nine hundred eighty-nine thousand, nine hundred ninety-one".