2891813117 has 2 divisors, whose sum is σ = 2891813118. Its totient is φ = 2891813116.

The previous prime is 2891813059. The next prime is 2891813131. The reversal of 2891813117 is 7113181982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2549341081 + 342472036 = 50491^2 + 18506^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891813117 - 2¹⁰ = 2891812093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891813147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445906558 + 1445906559.

It is an arithmetic number, because the mean of its divisors is an integer number (1445906559).

Almost surely, 2^2891813117 is an apocalyptic number.

It is an amenable number.

2891813117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891813117 is an equidigital number, since it uses as much as digits as its factorization.

2891813117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 2891813117 is about 53775.5810475349. The cubic root of 2891813117 is about 1424.6999457700.

The spelling of 2891813117 in words is "two billion, eight hundred ninety-one million, eight hundred thirteen thousand, one hundred seventeen".