121158709 has 4 divisors (see below), whose sum is σ = 138467104. Its totient is φ = 103850316.

The previous prime is 121158707. The next prime is 121158721. The reversal of 121158709 is 907851121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 907851121 = 2609 ⋅347969.

It is a cyclic number.

It is not a de Polignac number, because 121158709 - 2¹ = 121158707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121158701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8654187 + ... + 8654200.

It is an arithmetic number, because the mean of its divisors is an integer number (34616776).

Almost surely, 2^121158709 is an apocalyptic number.

It is an amenable number.

121158709 is a deficient number, since it is larger than the sum of its proper divisors (17308395).

121158709 is an equidigital number, since it uses as much as digits as its factorization.

121158709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17308394.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 121158709 is about 11007.2116814387. The cubic root of 121158709 is about 494.8249001467.

The spelling of 121158709 in words is "one hundred twenty-one million, one hundred fifty-eight thousand, seven hundred nine".