1345001989 has 2 divisors, whose sum is σ = 1345001990. Its totient is φ = 1345001988.

The previous prime is 1345001953. The next prime is 1345002011. The reversal of 1345001989 is 9891005431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 726733764 + 618268225 = 26958^2 + 24865^2 .

It is an emirp because it is prime and its reverse (9891005431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1345001989 is a prime.

It is a super-2 number, since 2×1345001989² = 3618060700827912242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345001789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672500994 + 672500995.

It is an arithmetic number, because the mean of its divisors is an integer number (672500995).

Almost surely, 2^1345001989 is an apocalyptic number.

It is an amenable number.

1345001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345001989 is an equidigital number, since it uses as much as digits as its factorization.

1345001989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1345001989 is about 36674.2687588996. The cubic root of 1345001989 is about 1103.8438496179.

The spelling of 1345001989 in words is "one billion, three hundred forty-five million, one thousand, nine hundred eighty-nine".