121718477 has 2 divisors, whose sum is σ = 121718478. Its totient is φ = 121718476.

The previous prime is 121718459. The next prime is 121718483. The reversal of 121718477 is 774817121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121462441 + 256036 = 11021^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 121718477 - 2⁸ = 121718221 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121718477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121718437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60859238 + 60859239.

It is an arithmetic number, because the mean of its divisors is an integer number (60859239).

Almost surely, 2^121718477 is an apocalyptic number.

It is an amenable number.

121718477 is a deficient number, since it is larger than the sum of its proper divisors (1).

121718477 is an equidigital number, since it uses as much as digits as its factorization.

121718477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21952, while the sum is 38.

The square root of 121718477 is about 11032.6097094024. The cubic root of 121718477 is about 495.5857800071.

The spelling of 121718477 in words is "one hundred twenty-one million, seven hundred eighteen thousand, four hundred seventy-seven".