2891729 has 2 divisors, whose sum is σ = 2891730. Its totient is φ = 2891728.

The previous prime is 2891701. The next prime is 2891737. The reversal of 2891729 is 9271982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2408704 + 483025 = 1552^2 + 695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2891729 is a prime.

It is a Chen prime.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 2891692 and 2891701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445864 + 1445865.

It is an arithmetic number, because the mean of its divisors is an integer number (1445865).

2^2891729 is an apocalyptic number.

It is an amenable number.

2891729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891729 is an equidigital number, since it uses as much as digits as its factorization.

2891729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 2891729 is about 1700.5084533750. The cubic root of 2891729 is about 142.4686131755.

The spelling of 2891729 in words is "two million, eight hundred ninety-one thousand, seven hundred twenty-nine".