2051999 has 2 divisors, whose sum is σ = 2052000. Its totient is φ = 2051998.

The previous prime is 2051969. The next prime is 2052023. The reversal of 2051999 is 9991502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2051999 - 2⁸ = 2051743 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025999 + 1026000.

It is an arithmetic number, because the mean of its divisors is an integer number (1026000).

2^2051999 is an apocalyptic number.

2051999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051999 is an equidigital number, since it uses as much as digits as its factorization.

2051999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 2051999 is about 1432.4800173126. The cubic root of 2051999 is about 127.0746868852.

The spelling of 2051999 in words is "two million, fifty-one thousand, nine hundred ninety-nine".