121661443 has 2 divisors, whose sum is σ = 121661444. Its totient is φ = 121661442.

The previous prime is 121661431. The next prime is 121661459. The reversal of 121661443 is 344166121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121661443 is a prime.

It is not a weakly prime, because it can be changed into another prime (121664443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60830721 + 60830722.

It is an arithmetic number, because the mean of its divisors is an integer number (60830722).

Almost surely, 2^121661443 is an apocalyptic number.

121661443 is a deficient number, since it is larger than the sum of its proper divisors (1).

121661443 is an equidigital number, since it uses as much as digits as its factorization.

121661443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 121661443 is about 11030.0246146598. The cubic root of 121661443 is about 495.5083618643.

The spelling of 121661443 in words is "one hundred twenty-one million, six hundred sixty-one thousand, four hundred forty-three".