121651817 has 8 divisors (see below), whose sum is σ = 139420800. Its totient is φ = 103980384.

The previous prime is 121651811. The next prime is 121651823. The reversal of 121651817 is 718156121.

It is an interprime number because it is at equal distance from previous prime (121651811) and next prime (121651823).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121651817 - 2¹⁶ = 121586281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121651811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21692 + ... + 26717.

It is an arithmetic number, because the mean of its divisors is an integer number (17427600).

Almost surely, 2^121651817 is an apocalyptic number.

It is an amenable number.

121651817 is a deficient number, since it is larger than the sum of its proper divisors (17768983).

121651817 is an equidigital number, since it uses as much as digits as its factorization.

121651817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48775.

The product of its digits is 3360, while the sum is 32.

The square root of 121651817 is about 11029.5882516076. The cubic root of 121651817 is about 495.4952931134.

The spelling of 121651817 in words is "one hundred twenty-one million, six hundred fifty-one thousand, eight hundred seventeen".