121895009 has 8 divisors (see below), whose sum is σ = 130298112. Its totient is φ = 113750560.

The previous prime is 121894991. The next prime is 121895047. The reversal of 121895009 is 900598121.

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 121895009 - 2²⁰ = 120846433 is a prime.

It is a super-2 number, since 2×121895009² = 29716786438220162, 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 121895009.

It is not an unprimeable number, because it can be changed into a prime (121895099) 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, 63689 + ... + 65574.

It is an arithmetic number, because the mean of its divisors is an integer number (16287264).

Almost surely, 2^121895009 is an apocalyptic number.

It is an amenable number.

121895009 is a deficient number, since it is larger than the sum of its proper divisors (8403103).

121895009 is a wasteful number, since it uses less digits than its factorization.

121895009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129327.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 121895009 is about 11040.6072749645. The cubic root of 121895009 is about 495.8252519707.

The spelling of 121895009 in words is "one hundred twenty-one million, eight hundred ninety-five thousand, nine".