121566671 has 2 divisors, whose sum is σ = 121566672. Its totient is φ = 121566670.

The previous prime is 121566649. The next prime is 121566689. The reversal of 121566671 is 176665121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121566671 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_6925742 and since 121566671 and 6925742 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121566631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60783335 + 60783336.

It is an arithmetic number, because the mean of its divisors is an integer number (60783336).

Almost surely, 2^121566671 is an apocalyptic number.

121566671 is a deficient number, since it is larger than the sum of its proper divisors (1).

121566671 is an equidigital number, since it uses as much as digits as its factorization.

121566671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 121566671 is about 11025.7276857358. The cubic root of 121566671 is about 495.3796645101.

The spelling of 121566671 in words is "one hundred twenty-one million, five hundred sixty-six thousand, six hundred seventy-one".