2061051991 has 2 divisors, whose sum is σ = 2061051992. Its totient is φ = 2061051990.

The previous prime is 2061051977. The next prime is 2061052013. The reversal of 2061051991 is 1991501602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2061051991 - 2⁹ = 2061051479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2061051901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030525995 + 1030525996.

It is an arithmetic number, because the mean of its divisors is an integer number (1030525996).

Almost surely, 2^2061051991 is an apocalyptic number.

2061051991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061051991 is an equidigital number, since it uses as much as digits as its factorization.

2061051991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 2061051991 is about 45398.8104579845. The cubic root of 2061051991 is about 1272.6128839713.

The spelling of 2061051991 in words is "two billion, sixty-one million, fifty-one thousand, nine hundred ninety-one".