121078309 has 4 divisors (see below), whose sum is σ = 132085440. Its totient is φ = 110071180.

The previous prime is 121078303. The next prime is 121078327. The reversal of 121078309 is 903870121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121078309 - 2¹⁵ = 121045541 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121078303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5503549 + ... + 5503570.

It is an arithmetic number, because the mean of its divisors is an integer number (33021360).

Almost surely, 2^121078309 is an apocalyptic number.

It is an amenable number.

121078309 is a deficient number, since it is larger than the sum of its proper divisors (11007131).

121078309 is a wasteful number, since it uses less digits than its factorization.

121078309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11007130.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 121078309 is about 11003.5589242754. The cubic root of 121078309 is about 494.7154219104.

The spelling of 121078309 in words is "one hundred twenty-one million, seventy-eight thousand, three hundred nine".