121718459 has 2 divisors, whose sum is σ = 121718460. Its totient is φ = 121718458.

The previous prime is 121718437. The next prime is 121718477. The reversal of 121718459 is 954817121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121718459 - 2²⁰ = 120669883 is a prime.

It is a super-2 number, since 2×121718459² = 29630766522669362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121717459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60859229 + 60859230.

It is an arithmetic number, because the mean of its divisors is an integer number (60859230).

Almost surely, 2^121718459 is an apocalyptic number.

121718459 is a deficient number, since it is larger than the sum of its proper divisors (1).

121718459 is an equidigital number, since it uses as much as digits as its factorization.

121718459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 38.

The square root of 121718459 is about 11032.6088936389. The cubic root of 121718459 is about 495.5857555777.

The spelling of 121718459 in words is "one hundred twenty-one million, seven hundred eighteen thousand, four hundred fifty-nine".