2116591 has 2 divisors, whose sum is σ = 2116592. Its totient is φ = 2116590.

The previous prime is 2116579. The next prime is 2116601. The reversal of 2116591 is 1956112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2116591 - 2⁵ = 2116559 is a prime.

It is a super-2 number, since 2×2116591² = 8959914922562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2116501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058295 + 1058296.

It is an arithmetic number, because the mean of its divisors is an integer number (1058296).

2^2116591 is an apocalyptic number.

2116591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116591 is an equidigital number, since it uses as much as digits as its factorization.

2116591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 25.

The square root of 2116591 is about 1454.8508514621. The cubic root of 2116591 is about 128.3942717656.

The spelling of 2116591 in words is "two million, one hundred sixteen thousand, five hundred ninety-one".