2891434789 has 2 divisors, whose sum is σ = 2891434790. Its totient is φ = 2891434788.

The previous prime is 2891434753. The next prime is 2891434921. The reversal of 2891434789 is 9874341982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1592409025 + 1299025764 = 39905^2 + 36042^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891434789 - 2²³ = 2883046181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891444789) 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 as a sum of consecutive naturals, namely, 1445717394 + 1445717395.

It is an arithmetic number, because the mean of its divisors is an integer number (1445717395).

Almost surely, 2^2891434789 is an apocalyptic number.

It is an amenable number.

2891434789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891434789 is an equidigital number, since it uses as much as digits as its factorization.

2891434789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 2891434789 is about 53772.0632763892. The cubic root of 2891434789 is about 1424.6378131948.

The spelling of 2891434789 in words is "two billion, eight hundred ninety-one million, four hundred thirty-four thousand, seven hundred eighty-nine".