1049943821 has 2 divisors, whose sum is σ = 1049943822. Its totient is φ = 1049943820.

The previous prime is 1049943803. The next prime is 1049943827. The reversal of 1049943821 is 1283499401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 685706596 + 364237225 = 26186^2 + 19085^2 .

It is a cyclic number.

It is not a de Polignac number, because 1049943821 - 2⁶ = 1049943757 is a prime.

It is a super-2 number, since 2×1049943821² = 2204764054512160082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1049943827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 524971910 + 524971911.

It is an arithmetic number, because the mean of its divisors is an integer number (524971911).

Almost surely, 2^1049943821 is an apocalyptic number.

It is an amenable number.

1049943821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1049943821 is an equidigital number, since it uses as much as digits as its factorization.

1049943821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1049943821 is about 32402.8366196542. The cubic root of 1049943821 is about 1016.3782294659.

The spelling of 1049943821 in words is "one billion, forty-nine million, nine hundred forty-three thousand, eight hundred twenty-one".