1020001000043 has 2 divisors, whose sum is σ = 1020001000044. Its totient is φ = 1020001000042.

The previous prime is 1020000999989. The next prime is 1020001000121. The reversal of 1020001000043 is 3400001000201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020001000043 is a prime.

It is a super-3 number, since 3×1020001000043³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020000999988 and 1020001000033.

It is not a weakly prime, because it can be changed into another prime (1020001008043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510000500021 + 510000500022.

It is an arithmetic number, because the mean of its divisors is an integer number (510000500022).

Almost surely, 2^{1020001000043} is an apocalyptic number.

1020001000043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020001000043 is an equidigital number, since it uses as much as digits as its factorization.

1020001000043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 1020001000043 its reverse (3400001000201), we get a palindrome (4420002000244).

The spelling of 1020001000043 in words is "one trillion, twenty billion, one million, forty-three", and thus it is an aban number and an uban number.