1020001989443 has 2 divisors, whose sum is σ = 1020001989444. Its totient is φ = 1020001989442.

The previous prime is 1020001989421. The next prime is 1020001989449. The reversal of 1020001989443 is 3449891000201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020001989443 - 2³⁶ = 951282512707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020001989443.

It is not a weakly prime, because it can be changed into another prime (1020001989449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510000994721 + 510000994722.

It is an arithmetic number, because the mean of its divisors is an integer number (510000994722).

Almost surely, 2^{1020001989443} is an apocalyptic number.

1020001989443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020001989443 is an equidigital number, since it uses as much as digits as its factorization.

1020001989443 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.

Adding to 1020001989443 its reverse (3449891000201), we get a palindrome (4469892989644).

The spelling of 1020001989443 in words is "one trillion, twenty billion, one million, nine hundred eighty-nine thousand, four hundred forty-three".