121698809 has 8 divisors (see below), whose sum is σ = 125892480. Its totient is φ = 117552816.

The previous prime is 121698793. The next prime is 121698817. The reversal of 121698809 is 908896121.

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 121698809 - 2⁴ = 121698793 is a prime.

It is a super-2 number, since 2×121698809² = 29621200224036962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121698809.

It is not an unprimeable number, because it can be changed into a prime (121698509) 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, 6689 + ... + 16974.

It is an arithmetic number, because the mean of its divisors is an integer number (15736560).

Almost surely, 2^121698809 is an apocalyptic number.

It is an amenable number.

121698809 is a deficient number, since it is larger than the sum of its proper divisors (4193671).

121698809 is a wasteful number, since it uses less digits than its factorization.

121698809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23839.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 121698809 is about 11031.7183158382. The cubic root of 121698809 is about 495.5590853304.

The spelling of 121698809 in words is "one hundred twenty-one million, six hundred ninety-eight thousand, eight hundred nine".