2991387689 has 2 divisors, whose sum is σ = 2991387690. Its totient is φ = 2991387688.

The previous prime is 2991387653. The next prime is 2991387713. The reversal of 2991387689 is 9867831992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2385834025 + 605553664 = 48845^2 + 24608^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991387689 - 2²⁴ = 2974610473 is a prime.

It is not a weakly prime, because it can be changed into another prime (2991387589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495693844 + 1495693845.

It is an arithmetic number, because the mean of its divisors is an integer number (1495693845).

Almost surely, 2^2991387689 is an apocalyptic number.

It is an amenable number.

2991387689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991387689 is an equidigital number, since it uses as much as digits as its factorization.

2991387689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 62.

The square root of 2991387689 is about 54693.5799614543. The cubic root of 2991387689 is about 1440.8681250990.

The spelling of 2991387689 in words is "two billion, nine hundred ninety-one million, three hundred eighty-seven thousand, six hundred eighty-nine".