2029991 has 2 divisors, whose sum is σ = 2029992. Its totient is φ = 2029990.

The previous prime is 2029981. The next prime is 2029997. The reversal of 2029991 is 1999202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2029991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2029997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014995 + 1014996.

It is an arithmetic number, because the mean of its divisors is an integer number (1014996).

2^2029991 is an apocalyptic number.

2029991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2029991 is an equidigital number, since it uses as much as digits as its factorization.

2029991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 2029991 is about 1424.7775264932. Note that the first 3 decimals coincide. The cubic root of 2029991 is about 126.6187545787.

The spelling of 2029991 in words is "two million, twenty-nine thousand, nine hundred ninety-one".