1022001989 has 2 divisors, whose sum is σ = 1022001990. Its totient is φ = 1022001988.

The previous prime is 1022001983. The next prime is 1022002031. The reversal of 1022001989 is 9891002201.

It is a happy number.

1022001989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 910530625 + 111471364 = 30175^2 + 10558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022001989 is a prime.

It is a super-2 number, since 2×1022001989² = 2088976131039912242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022001983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511000994 + 511000995.

It is an arithmetic number, because the mean of its divisors is an integer number (511000995).

Almost surely, 2^1022001989 is an apocalyptic number.

It is an amenable number.

1022001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022001989 is an equidigital number, since it uses as much as digits as its factorization.

1022001989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1022001989 is about 31968.7658347957. The cubic root of 1022001989 is about 1007.2808568027.

The spelling of 1022001989 in words is "one billion, twenty-two million, one thousand, nine hundred eighty-nine".