611969987 has 2 divisors, whose sum is σ = 611969988. Its totient is φ = 611969986.

The previous prime is 611969983. The next prime is 611969989. The reversal of 611969987 is 789969116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 611969987 - 2² = 611969983 is a prime.

Together with 611969989, it forms a pair of twin primes.

It is a Chen prime.

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, 305984993 + 305984994.

It is an arithmetic number, because the mean of its divisors is an integer number (305984994).

Almost surely, 2^611969987 is an apocalyptic number.

611969987 is a deficient number, since it is larger than the sum of its proper divisors (1).

611969987 is an equidigital number, since it uses as much as digits as its factorization.

611969987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 56.

The square root of 611969987 is about 24738.0271444592. The cubic root of 611969987 is about 849.0045957882.

The spelling of 611969987 in words is "six hundred eleven million, nine hundred sixty-nine thousand, nine hundred eighty-seven".