121781743 has 2 divisors, whose sum is σ = 121781744. Its totient is φ = 121781742.

The previous prime is 121781731. The next prime is 121781753. The reversal of 121781743 is 347187121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121781743 - 2¹⁷ = 121650671 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121781699 and 121781708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121781713) 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, 60890871 + 60890872.

It is an arithmetic number, because the mean of its divisors is an integer number (60890872).

Almost surely, 2^121781743 is an apocalyptic number.

121781743 is a deficient number, since it is larger than the sum of its proper divisors (1).

121781743 is an equidigital number, since it uses as much as digits as its factorization.

121781743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 34.

The square root of 121781743 is about 11035.4765642450. The cubic root of 121781743 is about 495.6716292006.

The spelling of 121781743 in words is "one hundred twenty-one million, seven hundred eighty-one thousand, seven hundred forty-three".