121461809 has 4 divisors (see below), whose sum is σ = 138813504. Its totient is φ = 104110116.

The previous prime is 121461793. The next prime is 121461817. The reversal of 121461809 is 908164121.

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: 908164121 = 227 ⋅4000723.

It is a cyclic number.

It is not a de Polignac number, because 121461809 - 2⁴ = 121461793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121461859) 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, 8675837 + ... + 8675850.

It is an arithmetic number, because the mean of its divisors is an integer number (34703376).

Almost surely, 2^121461809 is an apocalyptic number.

It is an amenable number.

121461809 is a deficient number, since it is larger than the sum of its proper divisors (17351695).

121461809 is an equidigital number, since it uses as much as digits as its factorization.

121461809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17351694.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 121461809 is about 11020.9713274284. The cubic root of 121461809 is about 495.2371872854.

The spelling of 121461809 in words is "one hundred twenty-one million, four hundred sixty-one thousand, eight hundred nine".