121717457 has 4 divisors (see below), whose sum is σ = 125007156. Its totient is φ = 118427760.

The previous prime is 121717447. The next prime is 121717459. The reversal of 121717457 is 754717121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86564416 + 35153041 = 9304^2 + 5929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121717457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121717459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1644794 + ... + 1644867.

It is an arithmetic number, because the mean of its divisors is an integer number (31251789).

Almost surely, 2^121717457 is an apocalyptic number.

It is an amenable number.

121717457 is a deficient number, since it is larger than the sum of its proper divisors (3289699).

121717457 is an equidigital number, since it uses as much as digits as its factorization.

121717457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289698.

The product of its digits is 13720, while the sum is 35.

The square root of 121717457 is about 11032.5634827088. The cubic root of 121717457 is about 495.5843956681.

The spelling of 121717457 in words is "one hundred twenty-one million, seven hundred seventeen thousand, four hundred fifty-seven".