2891081 has 2 divisors, whose sum is σ = 2891082. Its totient is φ = 2891080.

The previous prime is 2891051. The next prime is 2891087. The reversal of 2891081 is 1801982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2835856 + 55225 = 1684^2 + 235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2891081 is a prime.

It is a super-2 number, since 2×2891081² = 16716698697122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2891087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445540 + 1445541.

It is an arithmetic number, because the mean of its divisors is an integer number (1445541).

2^2891081 is an apocalyptic number.

It is an amenable number.

2891081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891081 is an equidigital number, since it uses as much as digits as its factorization.

2891081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 2891081 is about 1700.3179114507. The cubic root of 2891081 is about 142.4579705740.

The spelling of 2891081 in words is "two million, eight hundred ninety-one thousand, eighty-one".