2991387673 has 4 divisors (see below), whose sum is σ = 3006572580. Its totient is φ = 2976202768.

The previous prime is 2991387653. The next prime is 2991387689. The reversal of 2991387673 is 3767831992.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1783964169 + 1207423504 = 42237^2 + 34748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2991387673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2991387653) 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, 7592158 + ... + 7592551.

It is an arithmetic number, because the mean of its divisors is an integer number (751643145).

Almost surely, 2^2991387673 is an apocalyptic number.

It is an amenable number.

2991387673 is a deficient number, since it is larger than the sum of its proper divisors (15184907).

2991387673 is a wasteful number, since it uses less digits than its factorization.

2991387673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15184906.

The product of its digits is 3429216, while the sum is 55.

The square root of 2991387673 is about 54693.5798151849. The cubic root of 2991387673 is about 1440.8681225301.

The spelling of 2991387673 in words is "two billion, nine hundred ninety-one million, three hundred eighty-seven thousand, six hundred seventy-three".