2100691 has 2 divisors, whose sum is σ = 2100692. Its totient is φ = 2100690.

The previous prime is 2100661. The next prime is 2100713. The reversal of 2100691 is 1960012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100691 - 2⁷ = 2100563 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050345 + 1050346.

It is an arithmetic number, because the mean of its divisors is an integer number (1050346).

2^2100691 is an apocalyptic number.

2100691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100691 is an equidigital number, since it uses as much as digits as its factorization.

2100691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 2100691 is about 1449.3760726602. The cubic root of 2100691 is about 128.0719606760.

The spelling of 2100691 in words is "two million, one hundred thousand, six hundred ninety-one".