611969989 has 2 divisors, whose sum is σ = 611969990. Its totient is φ = 611969988.

The previous prime is 611969987. The next prime is 611969999. The reversal of 611969989 is 989969116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 573219364 + 38750625 = 23942^2 + 6225^2 .

It is a cyclic number.

It is not a de Polignac number, because 611969989 - 2¹ = 611969987 is a prime.

Together with 611969987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611969983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305984994 + 305984995.

It is an arithmetic number, because the mean of its divisors is an integer number (305984995).

Almost surely, 2^611969989 is an apocalyptic number.

It is an amenable number.

611969989 is a deficient number, since it is larger than the sum of its proper divisors (1).

611969989 is an equidigital number, since it uses as much as digits as its factorization.

611969989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 58.

The square root of 611969989 is about 24738.0271848828. The cubic root of 611969989 is about 849.0045967131.

The spelling of 611969989 in words is "six hundred eleven million, nine hundred sixty-nine thousand, nine hundred eighty-nine".