1051999649 has 2 divisors, whose sum is σ = 1051999650. Its totient is φ = 1051999648.

The previous prime is 1051999643. The next prime is 1051999747. The reversal of 1051999649 is 9469991501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 565488400 + 486511249 = 23780^2 + 22057^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051999649 - 2⁸ = 1051999393 is a prime.

It is a super-2 number, since 2×1051999649² = 2213406522992246402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1051999649.

It is not a weakly prime, because it can be changed into another prime (1051999643) 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, 525999824 + 525999825.

It is an arithmetic number, because the mean of its divisors is an integer number (525999825).

Almost surely, 2^1051999649 is an apocalyptic number.

It is an amenable number.

1051999649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051999649 is an equidigital number, since it uses as much as digits as its factorization.

1051999649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787320, while the sum is 53.

The square root of 1051999649 is about 32434.5440695565. The cubic root of 1051999649 is about 1017.0411654221.

The spelling of 1051999649 in words is "one billion, fifty-one million, nine hundred ninety-nine thousand, six hundred forty-nine".